add no robots meta if no results

src/components/DictionaryView.vue

@@ -393,6 +393,9 @@ export default {
     }
   },
   metaInfo() {
+    if (this.no_results) {
+      return {meta: [{name: "robots", content: 'none'}]}
+    }
     let q = ""
     if (this.$route.query.q) {
       q =  this.$route.query.q + " - "