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
{
	/**
	 * Writes the report design to the given output stream. The caller must call
	 * <code>onSave</code> if the save succeeds.
	 * 
	 * @param designHandle
	 *            the report design to serialize
	 * 
	 * @param out
	 *            the output stream to which the design is written.
	 * @throws IOException
	 *             if the file cannot be written to the output stream
	 *             successfully.
	 */
	public static void serialize( ReportDesignHandle designHandle,
			OutputStream out ) throws IOException
	{
		assert out != null;
		if ( designHandle == null )
			return;
		ReportDesign target = null;
		ReportDesign source = (ReportDesign) designHandle.getModule( );
		
		target = localizeDesign( source );
		assert target != null;