Bug 131484 Can't not add item by click the item from palette
Details: Can't not add item Setp: 1.New a report design and open the palette. 2.Click the lable icon. 3.Move the mouse to layout and click again to add the label. Actual result: Nothing is added in layout.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
*      org.eclipse.ui.IEditorInput)
	 */
	public void init( IEditorSite site, IEditorInput input )
			throws PartInitException
	{
		super.init( site, input );
		getSite( ).getWorkbenchWindow( )
				.getPartService( )
				.addPartListener( this );
		site.setSelectionProvider( new FormEditorSelectionProvider( this ) );
		IReportProvider provider = EditorUtil.getReportProvider( this, input );
		if ( provider != null && provider.getInputPath( input ) != null )
		{
			setPartName( provider.getInputPath( input ).lastSegment( ) );
		}
		else
		{
			setPartName( input.getName( ) );
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.forms.editor.FormEditor#addPages()
	 */
	protected void addPages( )
	{
		List formPageList = EditorContributorManager.getInstance( )
				.getEditorContributor( getEditorSite( ).getId( ) ).formPageList;
		boolean error = false;