display cron errors

dashboard/src/components/app/Cron.vue

@@ -41,15 +41,17 @@ const crontabDefault = `# +------------------------ minute (0 - 59)
 
 const busy = ref(false);
 const crontab = ref('');
+const submitError = ref({});
 
 async function onSubmit() {
   if (crontab.value === crontabDefault && !props.app.crontab) return;
   if (crontab.value === props.app.crontab) return;
 
+  submitError.value = {};
   busy.value = true;
 
   const [error] = await appsModel.configure(props.app.id, 'crontab', { crontab: crontab.value });
-  if (error) return console.error(error);
+  if (error) submitError.value.generic = error.body?.message || JSON.stringify(error);
 
   busy.value = false;
 }
@@ -73,6 +75,7 @@ onMounted(() => {
           </label>
           <div description>{{ $t('app.cron.description') }}</div>
           <textarea id="crontabInput" style="width: 100%; white-space: pre-wrap; font-family: monospace;" v-model="crontab" rows="10"></textarea>
+          <div class="error-label" v-show="submitError.generic">{{ submitError.generic }}</div>
         </FormGroup>
       </fieldset>
     </form>