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
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#getDefault()
	 */
	public Object getDefault( )
	{
		return extProperty.getDefaultValue( );
	}
	/*
	 * Returns the localized display name, if non-empty string can be found with
	 * resource key and <code> IMessages </code> . Otherwise, return name of
	 * this property.
	 * 
	 * @see org.eclipse.birt.report.model.metadata.PropertyDefn#getDisplayName()
	 */
	public String getDisplayName( )
	{
		if ( extProperty.getDisplayNameID( ) != null && messages != null )
		{
			String displayName = messages.getMessage( extProperty
					.getDisplayNameID( ), ThreadResources.getLocale( ) );
			if ( !StringUtil.isBlank( displayName ) )
				return displayName;
		}
		return extProperty.getName( );
	}
	/*
	 * (non-Javadoc)