标签为空的情况不占位

lib/pages/library/view.dart

@@ -74,7 +74,7 @@ class _LibraryPageState extends State<LibraryPage>  {
                 )
               ],
             ),
-            _buildLabel(),
+            controller.filterLabels.isEmpty?const SizedBox():_buildLabel(),
             Container(
               // color: Colors.red,
               child: Expanded(