fix dropdown checking filteredOptions instead of index

src/components/Dropdown.vue

@@ -112,7 +112,7 @@ export default {
       setTimeout(() => {
         this.isOpen = false;
       }, 0);
-      if (index) this.$emit("update:selection", this.filteredOptions[index]);
+      if (this.filteredOptions) this.$emit("update:selection", this.filteredOptions[index]);
       this.input = "";
     },