Bug 156497 [Regression][Acceptance]Report isn't refreshed when delete used library file.
Description: Report isn't refreshed when delete used library file. Steps to reproduce: 1.New a library, add a label, input actuate. 2.New a report, extend lib.label 3.Delete the library file. 4.Refresh the report in Outline of the report Expected result: Empty label in Layout. Actual result: label with content "actuate" in Layout.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/LibraryCommand.java
* Adds new library file to report design.
	 * 
	 * @param libraryFileName
	 *            library file name
	 * @param namespace
	 *            library namespace
	 * @throws DesignFileException
	 *             if the library file is not found or has fatal errors.
	 * @throws SemanticException
	 *             if failed to add <code>IncludeLibrary</code> strcutre
	 */
	public void addLibrary( String libraryFileName, String namespace )
			throws DesignFileException, SemanticException
	{
		if ( StringUtil.isBlank( namespace ) )
			namespace = StringUtil.extractFileName( libraryFileName );
		if ( module.isDuplicateNamespace( namespace ) )
		{
			throw new LibraryException(
					module,
					new String[]{namespace},
					LibraryException.DESIGN_EXCEPTION_DUPLICATE_LIBRARY_NAMESPACE );
		}
		
		URL url = module.findResource( libraryFileName,
				IResourceLocator.LIBRARY );
		if ( url != null
				&& module.getLibraryByLocation( url.toString( ) ) != null )
		{
			throw new LibraryException( module, new String[]{url.toString( )},