message: frontend: Fix handling of valueless labels
diff: @@ -17,13 +17,13 @@ export class SelectorInput extends React.Component {
  }
  static arrayify (obj) {
  - return _.map(obj, (v, k) => `${k}=${v}`);
  + return _.map(obj, (v, k) => v ? `${k}=${v}` : k);
  }
  static objectify (arr) {
  const result = {};
  _.each(arr, item => {
  - const [key, value] = item.split('=');
  + const [key, value = null] = item.split('=');
  result[key] = value;
  });
  return result;
  