Display any update check error

dashboard/src/components/SystemUpdate.vue

@@ -60,6 +60,7 @@ const currentPattern = ref('');
 const updateBusy = ref(false);
 const updateError = ref({});
 const stopError = ref({});
+const updateCheckError = ref({});
 const checkingBusy = ref(false);
 const pendingUpdate = ref(null);
 const skipBackup = ref(false);
@@ -108,6 +109,7 @@ async function refreshInfo() {
 
   updateError.value = {};
   stopError.value = {};
+  updateCheckError.value = {};
 
   pendingUpdate.value = result || null;
 }
@@ -218,9 +220,14 @@ async function onSubmitUpdate() {
 
 async function onCheck() {
   checkingBusy.value = true;
+  updateCheckError.value = {};
 
   const [error] = await updaterModel.checkBoxUpdate();
-  if (error) return console.error(error);
+  if (error) {
+    updateCheckError.value.generic = error.body?.message || 'Internal error';
+    checkingBusy.value = false;
+    return;
+  }
 
   await refreshInfo();
   checkingBusy.value = false;
@@ -336,6 +343,7 @@ onMounted(async () => {
       <p v-if="updateBusy && lastTask">{{ lastTask.message }}</p>
 
       <div class="error-label" v-if="stopError.generic">{{ stopError.generic }}</div>
+      <div class="error-label" v-if="updateCheckError.generic">{{ updateCheckError.generic }}</div>
 
       <div class="button-bar">
         <Button danger v-if="updateBusy" @click="onStop()">{{ $t('settings.updates.stopUpdateAction') }}</Button>