Issues with previewing data after switch from 7.7.x Teiid to 8.2.x Teiid default server

After switch from 8.2.x Teiid server to 7.7.x Teiid server, closing the project and deleting the Preview VDBs from the local files system (local eclipse workspace).....

• Opened Project
• Tried to Preview a table and got an NPE:
  • java.lang.NullPointerException
    at org.teiid.designer.runtime.preview.PreviewManager.getFullDeployedVdbName(PreviewManager.java:642)
    at org.teiid.designer.runtime.preview.PreviewManager.previewSetup(PreviewManager.java:1373)
    at org.teiid.designer.runtime.ui.preview.PreviewDataWorker$1.run(PreviewDataWorker.java:233)
    at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)

The method failing is:

private String getFullDeployedVdbName(ITeiidVdb deployedVdb) {
String fullVdbName = deployedVdb.getPropertyValue("deployment-name");;
if (!fullVdbName.endsWith(Vdb.FILE_EXTENSION))

{ fullVdbName = fullVdbName + Vdb.FILE_EXTENSION; }

return fullVdbName;

}

ITeiidVdb is a new SPI interface.

So was the "deployment-name" property available with Teiid 7.7.x runtime?

Also can't Undeploy VDB on 7.7.2 server