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/dialogs/ImportLibraryDialog.java
{
	private static final Image ERROR_ICON = ReportPlatformUIImages.getImage( ISharedImages.IMG_OBJS_ERROR_TSK );
	private static final String MSG_DIALOG_TITLE = Messages.getString( "ImportLibraryDialog.Title" ); 
	private static final String MSG_DIALOG_MESSAGE = Messages.getString( "ImportLibraryAction.Message" ); 
	private static final String MSG_DIALOG_NAMESPACE = Messages.getString( "ImportLibraryAction.Prefix" ); 
	private static final String MSG_DIALOG_ERROR_CANNOT_BE_EMPTY = Messages.getString( "ImportLibraryAction.Error.CannotBeEmpty" ); 
	private static final String MSG_DIALOG_ERROR_HAS_BEEN_USED = Messages.getString( "ImportLibraryAction.Error.HasBeenUsed" ); 
	private String namespace;
	private Text namespaceEditor;
	private CLabel messageLine;
	public ImportLibraryDialog( String namespace )
	{
		super( MSG_DIALOG_TITLE );
		this.namespace = namespace;