Can't force builds after a sighup.

[tsuna]

I changed a buildstep, then sighup the buildbot and then forced a build (from the web interface) and got this:

2007/11/20 18:35 CET [HTTPChannel,27,127.0.0.1] Traceback (most recent call last):
          File "/usr/lib/python2.4/site-packages/twisted/protocols/basic.py", line 240, in dataReceived
            return self.rawDataReceived(data)
          File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 1054, in rawDataReceived
            self.allContentReceived()
          File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 1045, in allContentReceived
            req.requestReceived(command, path, version)
          File "/usr/lib/python2.4/site-packages/twisted/web/http.py", line 601, in requestReceived
            self.process()
        --- <exception caught here> ---
          File "/usr/lib/python2.4/site-packages/twisted/web/server.py", line 159, in process
            resrc = self.site.getResourceFor(self)
          File "/usr/lib/python2.4/site-packages/twisted/web/server.py", line 514, in getResourceFor
            return resource.getChildForRequest(self.resource, request)
          File "/usr/lib/python2.4/site-packages/twisted/web/resource.py", line 50, in getChildForRequest
            resource = resource.getChildWithDefault(pathElement, request)
          File "/usr/lib/python2.4/site-packages/twisted/web/resource.py", line 150, in getChildWithDefault
            return self.getChild(path, request)
          File "/work/build/buildbot/lib/python2.4/site-packages/buildbot/status/web/builder.py", line 305, in getChild
            s = self.getStatus(req)
          File "/work/build/buildbot/lib/python2.4/site-packages/buildbot/status/web/base.py", line 279, in getStatus
            return request.site.buildbot_service.getStatus()
          File "/work/build/buildbot/lib/python2.4/site-packages/buildbot/status/web/baseweb.py", line 513, in getStatus
            return self.parent.getStatus()
        exceptions.AttributeError: 'NoneType' object has no attribute 'getStatus'

And the build did not start, obviously. I did a full restart and it worked again, so I guess there must be something wrong with sighup :)

[ijon]

Identical to #176.