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/api/util/DocumentUtil.java
{
				assert false;
			}
			Module sourceModule = source.getRoot( );
			assert sourceModule != null;
			DesignElement dataSet = source.getReferenceProperty( sourceModule,
					propName );
			
			if ( dataSet != null && dataSet.getRoot( ) != sourceDesign )
			{
				DesignElement copied = ModelUtil.getCopy( dataSet );
				addElement( targetDesign, copied, ReportDesign.DATA_SET_SLOT );
				target.setProperty( propName,
						new ElementRefValue( null, copied ) );
				
				resolveElementReference( targetDesign, sourceDesign, copied,
						dataSet );
			}
		}
	}
	/**
	 * Resolves style reference in the target element. This method will copy the
	 * resolved element reference from the source element to the target design.
	 * 
	 * @param targetDesign
	 *            the target design to add the copied style
	 * @param target
	 *            the target element to resolve the style
	 * @param source
	 *            the source element