'{0}' label is not shown anymore

Previously, '{0}' would be labelled as '-1 Times', which is not actually the case.
Also I am not sure to best visualize such a pattern, right now, except for the label,
'a{0}' looks similar to 'a?', even though they don't have the same effect.

src/js/parser/javascript/repeat.js

@@ -33,6 +33,9 @@ export default {
     label: {
       get: function() {
         if (this.minimum === this.maximum) {
+          if (this.minimum === 0) {
+            return undefined;
+          }
           return formatTimes(this.minimum - 1);
         } else if (this.minimum <= 1 && this.maximum >= 2) {
           return `at most ${formatTimes(this.maximum - 1)}`;