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
Object value = getLocalProperty( module, propDefn );
		if ( value != null )
			return value;
		
		
		
		if ( libReference != null && module != null )
		{
			ReferencableStructure refStruct = libReference.getTargetStructure( );
			if ( refStruct != null )
			{
				
				
				
				Library lib = module.getLibraryWithNamespace( libReference
						.getLibraryNamespace( ), IModuleNameScope.DIRECTLY_INCLUDED_LEVEL );
				Module root = lib == null ? module : lib;
				value = refStruct.getProperty( root, propDefn );
				if ( value != null )
					return value;
			}
		}
		if ( value == null )
			return propDefn.getDefault( );
		return value;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.Structure#getLocalProperty(org.eclipse.birt.report.model.core.Module,