Bug 122283 [Smoke][Regression][SPM-Linux WS]Item in library can't be used when include library from library explorer
Details: Item in library can't be used when include library from library explorer Step: 1.New a library and Insert a label. 2.Open a report design 3.Open the library exploer in report and use the library 4.Drop the library label from library explorer into layout Actual results: Expection pop up. If use the library from report outline, label can drop in layout succeed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
{
			if ( activePageOnly )
			{
				IWorkbenchPage pg = window.getActivePage( );
				if ( pg != null )
				{
					IEditorPart editor = pg.getActiveEditor( );
					if ( editor != null
							&& editor.getEditorInput( ) instanceof IReportEditorInput )
					{
						if ( editor instanceof AbstractMultiPageLayoutEditor )
						{
							return (AbstractMultiPageLayoutEditor) editor;
						}
					}
				}
			}
			else
			{
				IWorkbenchPage[] pgs = window.getPages( );
				for ( int i = 0; i < pgs.length; i++ )
				{
					IWorkbenchPage pg = pgs[i];
					if ( pg != null )
					{
						IEditorPart editor = pg.getActiveEditor( );
						if ( editor != null
								&& editor.getEditorInput( ) instanceof IReportEditorInput )
						{
							if ( editor instanceof AbstractMultiPageLayoutEditor )