buildbot/buildbot — pull request #590 by tomprince (2012-12-08 07:26:45+00:00)
Title: Don't call MultiService.stopService if we haven't called MultiService.stopService

As per the discussion in http://twistedmatrix.com/trac/ticket/6202
Thus, we don't need to patch around 6502.

@djmitche: There doesn't seem to be any tests for this, so I'm not sure how it was triggered. Thus, this is untested.