Bug 153040 Template definition should be removed after the report item is deleted
Steps to reproduce: 1.New a report, extends lib.label 2.Convert the label to template report item, and revert it back to the report item 3.Delete the label 4.Remove the included library Expected result: Library can be removed Actual result: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Model Plug-in ID:org.eclipse.birt.report.model Version:2.1.0.v20060808-0630 Error Code:Error.LibraryException.LIBRARY_HAS_DESCENDENTS Error Message:The library "Lib" can no be dropped because it has descendents "NewLabel" in the current module.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
throws ContentException
	{
		assert content != null;
		
		if ( !element.getDefn( ).isContainer( ) )
			throw new ContentException( element, slotID,
					ContentException.DESIGN_EXCEPTION_NOT_CONTAINER );
		ContainerSlot slot = element.getSlot( slotID );
		if ( slot == null )
			throw new ContentException( element, slotID,
					ContentException.DESIGN_EXCEPTION_SLOT_NOT_FOUND );
		if ( !content.isContentOf( element ) )
			throw new ContentException( element, slotID, content,
					ContentException.DESIGN_EXCEPTION_CONTENT_NOT_FOUND );
		
		SlotDefn slotInfo = (SlotDefn) element.getDefn( ).getSlot( slotID );
		if ( !slotInfo.isMultipleCardinality( ) )
			return;
		
		
		if ( content.isVirtualElement( ) )
			throw new ContentException(
					element,
					slotID,
					content,
					ContentException.DESIGN_EXCEPTION_STRUCTURE_CHANGE_FORBIDDEN );
		if ( !canMovePosition( content, slotID, newPosn ) )
			throw new ContentException( element, slotID,
					ContentException.DESIGN_EXCEPTION_MOVE_FORBIDDEN );
		int oldPosn = slot.findPosn( content );