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/metadata/ExtensionModelPropertyDefn.java
{
	/**
	 * The effective extension property definition.
	 */
	private IPropertyDefinition extProperty = null;
	/**
	 * The messages providing the localized message.
	 */
	private IMessages messages = null;
	/**
	 * Constructs the extension element property definition with an effective
	 * extension property.
	 * 
	 * @param extPropertyDefn
	 *            the effective extension property definition
	 * @param messages
	 *            the messages providing the localized messages
	 */
	public ExtensionModelPropertyDefn( IPropertyDefinition extPropertyDefn,
			IMessages messages )
	{
		extProperty = extPropertyDefn;
		assert extProperty != null;
		MetaDataDictionary dd = MetaDataDictionary.getInstance( );
		type = dd.getPropertyType( extProperty.getType( ) );
		name = extProperty.getName( );
		defaultValue = extProperty.getDefaultValue( );