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/api/ModuleHandle.java
* @throws SemanticException
	 *             if errors occured when drop the library.It may be because
	 *             that the library is not found in the design or that some
	 *             elements can not be localized properly.
	 */
	public void dropLibraryAndBreakExtends( LibraryHandle library )
			throws SemanticException
	{
		if ( library == null )
			return;
		LibraryCommand command = new LibraryCommand( module );
		command.dropLibraryAndBreakExtends( (Library) library.getElement( ) );
	}
	/**
	 * Adds one attribute listener. The duplicate listener will not be added.
	 * 
	 * @param listener
	 *            the attribute listener to add
	 */
	public void addAttributeListener( IAttributeListener listener )
	{
		getModule( ).addAttributeListener( listener );
	}
	/**
	 * Removes one attribute listener. If the listener not registered, then the
	 * request is silently ignored.
	 * 
	 * @param listener
	 *            the attribute listener to remove
	 * @return <code>true</code> if <code>listener</code> is successfully