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
IChoiceSet choiceSet = getChoices( );
			IChoice[] choices = choiceSet.getChoices( );
			for ( int i = 0; i < choices.length; i++ )
			{
				UserChoice choice = (UserChoice) choices[i];
				Object value = choice.getValue( );
				if ( StringUtil.isBlank( choice.getName( ) ) )
				{
					throw new UserPropertyException(
							element,
							name,
							UserPropertyException.DESIGN_EXCEPTION_CHOICE_NAME_REQUIRED );
				}
				if ( value == null )
					throw new UserPropertyException(
							element,
							name,
							UserPropertyException.DESIGN_EXCEPTION_CHOICE_VALUE_REQUIRED );
				if ( getTypeCode( ) != PropertyType.CHOICE_TYPE )
				{
					try
					{
						value = validateValue( module, value );
					}
					catch ( PropertyValueException e )
					{
						throw new UserPropertyException(
								element,
								name,
								UserPropertyException.DESIGN_EXCEPTION_INVALID_CHOICE_VALUE );