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
* @param source
	 *            the source element
	 */
	static void resolveDataSet( ReportDesign targetDesign,
			ReportDesign sourceDesign, DesignElement target,
			DesignElement source )
	{
		assert targetDesign != null && target != null && source != null;
		if ( source instanceof JointDataSet )
		{
			Module sourceModule = source.getRoot( );
			assert sourceModule != null;
			List dataSets = source.getListProperty( sourceModule,
					JointDataSet.DATA_SETS_PROP );
			if ( dataSets != null )
			{
				List values = new ArrayList( );
				for ( int i = 0; i < dataSets.size( ); i++ )
				{
					ElementRefValue value = (ElementRefValue) dataSets.get( i );
					
					
					if ( value.isResolved( )
							&& value.getElement( ).getRoot( ) != sourceDesign )
					{
						DesignElement copied = ModelUtil.getCopy( value
								.getElement( ) );
						addElement( targetDesign, copied,
								ReportDesign.DATA_SET_SLOT );