Bug 153378 [Regression]Label text won't show up when the text key is not found
Steps to reproduce: 1.Add a label, set text to "aaa" 2.Add a resource file "a" to the report, add a text key "k1" which is not in the a.properties to the label 3.Preview in Web Viewer Expected result: Label display "aaa" when the text key is not found Actual result: Nothing in preview
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/ReferencableStructure.java
}
		else
			assert false;
	}
	/**
	 * Implements to cache a back-pointer from a referenced structure.
	 * 
	 * @param oldRef
	 *            the old reference, if any
	 * @param newRef
	 *            the new reference, if any
	 */
	protected void updateReference( StructRefValue oldRef, StructRefValue newRef )
	{
		ReferencableStructure target;
		
		
		if ( oldRef != null )
		{
			target = oldRef.getTargetStructure( );
			if ( target != null )
				target.dropClientStructure( this );
		}
		
		
		
		if ( newRef != null )
		{
			target = newRef.getTargetStructure( );
			if ( target != null )