message: email is mandatory
diff: @@ -188,7 +188,7 @@ const addUser = (
  ): Promise<Object> =>
  graphqlapi.mutate(
  `
  - ($id: Int, $email: String, $firstName: String, $lastName: String, $comment: String, $gitlabId: Int) {
  + ($id: Int, $email: String!, $firstName: String, $lastName: String, $comment: String, $gitlabId: Int) {
  addUser(input: {
  id: $id
  email: $email
  