Merge branch 'dev-3.8' of https://git.mesalab.cn/nezha/nezha-fronted into dev-3.9

nezha-fronted/src/assets/css/components/common/alert/alertLabel.scss

@@ -4,6 +4,7 @@
   z-index: 3000;
   border-radius: 4px;
   box-shadow: -1px 1px 10px -1px $--dropdown-menu-box-shadow-color;
+  max-width: 800px;
   .alert-label-header-title {
     padding: 10px 15px;
     display: flex;

nezha-fronted/src/components/page/dashboard/dashboard.vue

@@ -11,7 +11,7 @@
           <div v-if="panelData.length === 0" class="top-tool-left" style="margin-left: 10px;">
             <button id="dashboard-add-panel" class="nz-btn nz-btn-style-light nz-btn-size-small" v-has="'main_add'" @click="toAdd"><i class="nz-icon nz-icon-create-square"></i>&nbsp;&nbsp;{{$t("overall.addDashboard")}}</button>
           </div>
-          <template v-else>
+          <template v-if="panelData.length">
             <div class="top-tool-left" style="cursor: pointer;">
               <select-dashboard
                 ref="selectDashboard"