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/api/core/UserPropertyDefn.java
if ( displayName == null || hasChoices( ) == false )
			return null;
		IChoiceSet choiceSet = getChoices( );
		UserChoice choice = choiceSet.findUserChoiceByDisplayName( module,
				displayName );
		if ( choice != null )
			return choice.getName( );
		return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#getStructDefn()
	 */
	public IStructureDefn getStructDefn( )
	{
		return MetaDataDictionary.getInstance( ).getStructure( STRUCTURE_NAME );
	}
	/**
	 * User-defined methods are not supported.
	 * 
	 * @return <code>null</code>
	 */
	public MethodInfo getMethodInfo( )
	{
		assert false;
		return null;
	}
	/**
	 * Sets the property type.