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
resolveElementReference( targetDesign, sourceDesign,
								copied, value.getElement( ) );
						
						
						values.add( new ElementRefValue( null, copied ) );
						( (ReferenceableElement) copied ).addClient( target,
								JointDataSet.DATA_SETS_PROP );
					}
					else
						values.add( value.copy( ) );
				}
				target.setProperty( JointDataSet.DATA_SETS_PROP, values );
			}
		}
		else
		{
			String propName = null;
			if ( source instanceof CascadingParameterGroup )
			{
				propName = CascadingParameterGroup.DATA_SET_PROP;
			}
			else if ( source instanceof ScalarParameter )
			{
				propName = ScalarParameter.DATASET_NAME_PROP;
			}
			else if ( source instanceof ReportItem )
			{
				propName = ReportItem.DATA_SET_PROP;
			}
			else