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
content,
					ContentException.DESIGN_EXCEPTION_STRUCTURE_CHANGE_FORBIDDEN );
		
		if ( element.isContentOf( content ) )
			throw new ContentException( element, slotID, content,
					ContentException.DESIGN_EXCEPTION_RECURSIVE );
		
		if ( !slotInfo.isMultipleCardinality( )
				&& element.getSlot( slotID ).getCount( ) > 0 )
		{
			throw new ContentException( element, slotID,
					ContentException.DESIGN_EXCEPTION_SLOT_IS_FULL );
		}
		if ( slotID == Module.COMPONENT_SLOT )
		{
			if ( StringUtil.isBlank( content.getName( ) ) )
				throw new ContentException( element, slotID, content,
						ContentException.DESIGN_EXCEPTION_CONTENT_NAME_REQUIRED );
		}
		checkContainmentContext( slotID, content );
		
		ContentRecord addRecord;
		if ( newPos == -1 )
		{
			addRecord = new ContentRecord( module, element, slotID, content,
					true );
		}
		else
		{
			addRecord = new ContentRecord( module, element, slotID, content,