NPEs upon deletion of salesforce model from the workspace

1) Import model from salesforce 2) Open editor and click on the table editor tab 3) In modelExplorer, delete the newly created model. This results in numerous NPEs: java.lang.NullPointerException at com.metamatrix.modeler.internal.ui.properties.udp.ExtensionPropertySource.getPropertyValue(ExtensionPropertySource.java:154) at com.metamatrix.modeler.internal.ui.properties.ModelObjectPropertySource.getPropertyValue(ModelObjectPropertySource.java:299) at com.metamatrix.modeler.internal.ui.table.ModelRowElement.getValue(ModelRowElement.java:295) at com.metamatrix.modeler.internal.ui.table.ModelTableLabelProvider.getColumnText(ModelTableLabelProvider.java:35) at org.eclipse.jface.viewers.TableColumnViewerLabelProvider.update(TableColumnViewerLabelProvider.java:70) at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:152) at org.eclipse.jface.viewers.AbstractTableViewer.doUpdateItem(AbstractTableViewer.java:399) at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:485)