Offline usage - NPE from Ruleset Editor rule's tree selection

I'm not 100% sure, but I think this is from not having the XSD available when opening the ruleset editor (because we're offline), or is this an WST update issue? Isn’t it supposed to use the provided/shipped XSD?

• Reproducible when opening ruleset, going to rules tab, and selecting on of the rule nodes in the tree.

Caused by: java.lang.NullPointerException
at org.eclipse.wst.xml.core.internal.contentmodel.modelqueryimpl.ModelQueryImpl$AvailableContentCMVisitor.computeAvailableContent(ModelQueryImpl.java:649)
at org.eclipse.wst.xml.core.internal.contentmodel.modelqueryimpl.ModelQueryImpl.getAvailableContent(ModelQueryImpl.java:309)
at org.jboss.tools.windup.ui.internal.rules.delegate.RuleDelegate$DetailsTab.findDeclaration(RuleDelegate.java:157)
at org.jboss.tools.windup.ui.internal.rules.delegate.RuleDelegate$DetailsTab.createTaskArea(RuleDelegate.java:166)
at org.jboss.tools.windup.ui.internal.rules.delegate.RuleDelegate$DetailsTab.createControls(RuleDelegate.java:150)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
... 51 more

====

!ENTRY org.eclipse.ui 4 0 2018-03-28 12:25:37.284
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction.createRule(NewRulesetElementAction.java:70)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction.performAction(NewRulesetElementAction.java:62)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction.access$0(NewRulesetElementAction.java:58)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction$1.run(NewRulesetElementAction.java:52)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction.run(NewRulesetElementAction.java:55)
at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:167)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
at org.eclipse.jface.action.ActionContributionItem.lambda$5(ActionContributionItem.java:436)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4258)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1502)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1525)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1510)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1314)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4082)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3699)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1150)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1039)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
at org.eclipse.equinox.launcher.Main.run(Main.java:1499)

!ENTRY org.eclipse.ui 4 0 2018-03-28 12:25:39.199
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
at java.util.ArrayList.rangeCheck(ArrayList.java:657)
at java.util.ArrayList.get(ArrayList.java:433)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction.createRule(NewRulesetElementAction.java:70)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction.performAction(NewRulesetElementAction.java:62)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction.access$0(NewRulesetElementAction.java:58)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction$1.run(NewRulesetElementAction.java:52)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.jboss.tools.windup.ui.internal.editor.NewRulesetElementAction.run(NewRulesetElementAction.java:55)
at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:167)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
at org.eclipse.jface.action.ActionContributionItem.lambda$5(ActionContributionItem.java:436)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4258)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1502)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1525)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1510)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1314)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4082)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3699)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1150)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1039)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
at org.eclipse.equinox.launcher.Main.run(Main.java:1499)