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
{
			resolveDataSet( targetDesign, sourceDesign, target, source );
		}
		else if ( source instanceof SimpleDataSet )
		{
			resolveDataSource( targetDesign, sourceDesign, target, source );
		}
		else if ( source instanceof JointDataSet )
		{
			resolveDataSet( targetDesign, sourceDesign, target, source );
		}
		else if ( source instanceof MasterPage )
		{
			resolveStyle( targetDesign, target, source );
		}
		else if ( source instanceof ReportItem )
		{
			if ( source instanceof Label || source instanceof TextItem )
			{
				localizeExternalStringProperty( sourceDesign, target, source );
			}
			if ( source instanceof ImageItem )
			{
				resolveImageItem( targetDesign, sourceDesign, target, source );
			}
			resolveDataSet( targetDesign, sourceDesign, target, source );
			resolveStyle( targetDesign, target, source );
		}
		else if ( source instanceof StyledElement )
		{