show errors when search failed;

src/App.vue

@@ -96,6 +96,10 @@ export default {
             tableInst.rowClass = "table-row-search";
             tableInst.create();
           }
+          if (data.error) {
+            helper.resetSearch(vm);
+            helper.error(data.error);
+          }
         })
         .send();
     },

src/utils/helper.js

@@ -248,7 +248,11 @@ const helper = {
         }
     },
     t: function (str) {
-       return t("ncdownloader", str);
+        return t("ncdownloader", str);
+    },
+    resetSearch: function (vm) {
+        vm.$data.loading = 0;
+        contentTable.getInstance([], []).clear();
     }
 }