Bug 140542 label can't be displayed without resource file or unmatched key
Steps to reproduce: 1.New a report, add a lable with text "aaa" 2.Add a resource file for the report, set key to "key1", value to "actuate", apply the value to the label 3.Clear the resource file in Property Editor->General->Resource File (or change the key to "abc") 4.Preview the report Expected result: 1.Display label text "aaa" on preview or 2.Give a warning message to say resource file is not found or unmatched key Actual result: Nothing displays on preview
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
{
		if ( theme == null )
			return null;
		return (Theme) theme.getElement( );
	}
	/**
	 * Gets the name of the referenced theme on this element.
	 * 
	 * @return theme name. null if the theme is not defined on the element.
	 */
	public String getThemeName( )
	{
		if ( theme == null )
			return null;
		return theme.getName( );
	}
	/**
	 * Returns the resolved theme of the report design/library.
	 * 
	 * @param module
	 *            the module to resolve the theme
	 * @return the resolved theme of the report design/library
	 */
	public Theme getTheme( Module module )
	{
		if ( theme == null )
			return null;
		if ( theme.isResolved( ) )
			return (Theme) theme.getElement( );
		IModuleNameSpace resolver = module