BaseInput.js: Always reset the data input's value upon submit

The current terms, if any, are set as json on the input. Though,
if there are none, the input was not reset and the previous json
was submitted again.

asset/js/widget/BaseInput.js

@@ -956,9 +956,13 @@ define(["../notjQuery", "Completer"], function ($, Completer) {
 
                 // This is not part of `onSubmit()` because otherwise it would override what `autoSubmit()` does
                 this.dataInput.value = JSON.stringify({ type: 'submit', terms: this.usedTerms });
+
+                return;
             } else if (this.manageRequired && ! this.hasTerms()) {
                 this.input.required = true;
             }
+
+            this.dataInput.value = '';
         }
 
         onPaste(event) {