Fix bug with change parameter type when there are no parameters in argument list Change-Id: I5cabd16091cb66be45f107a3701128776e8129ed Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/310820 Commit-Queue: Keerti Parthasarathy <keertip@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> https://dart.googlesource.com/sdk/+/a023c3f00e75b08c5694c6c229b9af4e610d6adf