Comment 2 for bug 1702369

Fixed in rev 1833:

revno: 1833
committer: bryce <email address hidden>
branch nick: terminator
timestamp: Mon 2020-03-16 18:15:31 -0700
message:
  Fix crash when there are no predefined windows

      Traceback (most recent call last):
        File "/usr/bin/terminator", line 126, in <module>
        TERMINATOR.layout_done()
        File "/usr/share/terminator/terminatorlib/terminator.py", line 395, in layout_done
        if window not in self.prelayout_windows:
      TypeError: argument of type 'NoneType' is not iterable

  fixes: https://bugs.launchpad.net/terminator/+bug/1702369