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
* All libraries which are included in this module.
	 */
	private List libraries = null;
	/**
	 * The attribute listener list to handle the file name changed events.
	 */
	private List attributeListeners = null;
	/**
	 * Dispose listener list to handle the design disposal events.
	 */
	private List disposeListeners = null;
	/**
	 * The theme for the module.
	 */
	private ElementRefValue theme = null;
	/**
	 * The fatal exception found in the included modules, which will stop
	 * opening the outer-most module.
	 */
	protected Exception fatalException;
	/**
	 * The registered name manager of this module.
	 */
	protected INameManager nameManager = null;
	/**
	 * The registered API backward compatibility manager of this module.
	 */
	protected VersionControlMgr versionMgr = null;
	/**
	 * Default constructor.