Add support for extra info: URLs (#182)

* Always show Down button

* Add URL and improve ArrayInput handling

* Minor

frontend/src/components/ArraySelect.vue

@@ -49,8 +49,7 @@ export default {
         array() {
             // Create the array if not exists, it should be safe.
             if (!this.service[this.name]) {
-                // eslint-disable-next-line vue/no-side-effects-in-computed-properties
-                this.service[this.name] = [];
+                return [];
             }
             return this.service[this.name];
         },
@@ -89,6 +88,10 @@ export default {
     },
     methods: {
         addField() {
+            // Create the array if not exists.
+            if (!this.service[this.name]) {
+                this.service[this.name] = [];
+            }
             this.array.push("");
         },
         remove(index) {