hotfix(ui): Show label search filter only when label list is not empty

lib/features/mailbox_dashboard/presentation/mailbox_dashboard_view_web.dart

@@ -650,6 +650,7 @@ class MailboxDashBoardView extends BaseMailboxDashBoardView {
       final isThreadRoute =
           controller.dashboardRoute.value == DashboardRoutes.thread;
       final isLabelAvailable = controller.isLabelAvailable;
+      final labelList = controller.labelController.labels;
 
       if (isSearchEmailRunning && isThreadRoute) {
         return Padding(
@@ -678,7 +679,7 @@ class MailboxDashBoardView extends BaseMailboxDashBoardView {
                       children: [
                         _buildQuickSearchFilterButton(context, QuickSearchFilter.folder),
                         MailboxDashboardViewWebStyle.searchFilterSizeBoxMargin,
-                        if (isLabelAvailable)
+                        if (isLabelAvailable && labelList.isNotEmpty)
                           ...[
                             _buildQuickSearchFilterButton(
                               context,

lib/features/mailbox_dashboard/presentation/widgets/advanced_search/advanced_search_input_form.dart

@@ -131,7 +131,7 @@ class AdvancedSearchInputForm extends GetWidget<AdvancedFilterController> {
 
             final labelSelected = controller.selectedLabel.value;
 
-            if (isLabelAvailable) {
+            if (isLabelAvailable && labels.isNotEmpty) {
               return AdvancedSearchFieldWidget(
                 filterField: FilterField.labels,
                 padding: const EdgeInsets.only(bottom: 12),