Avoid some flickering in the Updates UI

dashboard/src/components/SystemUpdate.vue

@@ -316,7 +316,7 @@ onMounted(async () => {
 
     <Section :title="$t('settings.updates.title')">
       <template #header-buttons>
-        <Button tool :menu="taskLogsMenu">{{ $t('main.action.logs') }}</Button>
+        <Button tool :menu="taskLogsMenu" :disabled="taskLogsMenu.length === 0">{{ $t('main.action.logs') }}</Button>
       </template>
 
       <p v-html="$t('settings.updates.description')"></p>
@@ -324,8 +324,8 @@ onMounted(async () => {
       <SettingsItem>
         <FormGroup>
           <label>{{ $t('settings.updates.schedule') }}</label>
-          <span v-show="currentPattern !== 'never'">{{ prettyAutoUpdateSchedule(currentPattern) }}</span>
-          <span v-show="currentPattern === 'never'">{{ $t('settings.updates.disabled') }}</span>
+          <span v-if="currentPattern !== 'never'">{{ prettyAutoUpdateSchedule(currentPattern) || '-' }}</span>
+          <span v-else>{{ $t('settings.updates.disabled') }}</span>
         </FormGroup>
         <div style="display: flex; align-items: center">
           <Button tool plain @click="onShowConfigure()">{{ $t('main.dialog.edit') }}</Button>