THRIFT-4670: Twisted, slots, and void method fails with "object has no attribute 'success'"
THRIFT-4670: Twisted, slots, and void method fails with "object has no attribute 'success'"

For a void method, there is no success value, so, it is an error to
attempt to assign one to the result object. This error is harmless
unless slots is also specified - with slots specified, the attempt to
assign to a non-existent field causes an error which makes the service
method fail.

Client: py

yongju-hong/thrift,bgould/thrift,eamosov/thrift,nsuke/thrift,strava/thrift,Jens-G/thrift,eamosov/thrift,Jens-G/thrift,creker/thrift,bgould/thrift,gadLinux/thrift,dcelasun/thrift,Jens-G/thrift,RobberPhex/thrift,bgould/thrift,apache/thrift,Jens-G/thrift,eamosov/thrift,Jens-G/thrift,nsuke/thrift,yongju-hong/thrift,yongju-hong/thrift,eamosov/thrift,jeking3/thrift,apache/thrift,bgould/thrift,nsuke/thrift,jeking3/thrift,bforbis/thrift,dcelasun/thrift,dcelasun/thrift,bgould/thrift,eamosov/thrift,eamosov/thrift,strava/thrift,RobberPhex/thrift,RobberPhex/thrift,creker/thrift,strava/thrift,jeking3/thrift,apache/thrift,gadLinux/thrift,apache/thrift,apache/thrift,gadLinux/thrift,nsuke/thrift,dcelasun/thrift,gadLinux/thrift,gadLinux/thrift,jeking3/thrift,yongju-hong/thrift,bforbis/thrift,RobberPhex/thrift,RobberPhex/thrift,RobberPhex/thrift,bgould/thrift,Jens-G/thrift,jeking3/thrift,Jens-G/thrift,jeking3/thrift,nsuke/thrift,creker/thrift,nsuke/thrift,bforbis/thrift,gadLinux/thrift,yongju-hong/thrift,nsuke/thrift,bforbis/thrift,gadLinux/thrift,yongju-hong/thrift,strava/thrift,jeking3/thrift,strava/thrift,apache/thrift,nsuke/thrift,bforbis/thrift,creker/thrift,bforbis/thrift,strava/thrift,apache/thrift,eamosov/thrift,eamosov/thrift,yongju-hong/thrift,bforbis/thrift,creker/thrift,strava/thrift,bforbis/thrift,dcelasun/thrift,bforbis/thrift,creker/thrift,bforbis/thrift,eamosov/thrift,bgould/thrift,bgould/thrift,creker/thrift,apache/thrift,Jens-G/thrift,bforbis/thrift,Jens-G/thrift,Jens-G/thrift,jeking3/thrift,jeking3/thrift,bgould/thrift,RobberPhex/thrift,RobberPhex/thrift,dcelasun/thrift,bforbis/thrift,nsuke/thrift,gadLinux/thrift,jeking3/thrift,dcelasun/thrift,apache/thrift,bgould/thrift,nsuke/thrift,dcelasun/thrift,bforbis/thrift,nsuke/thrift,apache/thrift,Jens-G/thrift,eamosov/thrift,jeking3/thrift,yongju-hong/thrift,bgould/thrift,dcelasun/thrift,RobberPhex/thrift,yongju-hong/thrift,apache/thrift,strava/thrift,RobberPhex/thrift,gadLinux/thrift,Jens-G/thrift,yongju-hong/thrift,gadLinux/thrift,bforbis/thrift,strava/thrift,apache/thrift,bforbis/thrift,creker/thrift,creker/thrift,nsuke/thrift,yongju-hong/thrift,yongju-hong/thrift,RobberPhex/thrift,eamosov/thrift,yongju-hong/thrift,RobberPhex/thrift,dcelasun/thrift,Jens-G/thrift,yongju-hong/thrift,dcelasun/thrift,eamosov/thrift,jeking3/thrift,Jens-G/thrift,strava/thrift,bforbis/thrift,bgould/thrift,creker/thrift,bforbis/thrift,gadLinux/thrift,yongju-hong/thrift,RobberPhex/thrift,strava/thrift,dcelasun/thrift,bgould/thrift,strava/thrift,creker/thrift,gadLinux/thrift,nsuke/thrift,bgould/thrift,creker/thrift,jeking3/thrift,creker/thrift,RobberPhex/thrift,gadLinux/thrift,dcelasun/thrift,RobberPhex/thrift,dcelasun/thrift,nsuke/thrift,strava/thrift,jeking3/thrift,dcelasun/thrift,RobberPhex/thrift,jeking3/thrift,apache/thrift,nsuke/thrift,creker/thrift,gadLinux/thrift,dcelasun/thrift,Jens-G/thrift,jeking3/thrift,strava/thrift,eamosov/thrift,Jens-G/thrift,apache/thrift,strava/thrift,apache/thrift,nsuke/thrift,bgould/thrift,nsuke/thrift,dcelasun/thrift,yongju-hong/thrift,strava/thrift,RobberPhex/thrift,Jens-G/thrift,eamosov/thrift,gadLinux/thrift,apache/thrift,gadLinux/thrift,strava/thrift,Jens-G/thrift,yongju-hong/thrift,eamosov/thrift,gadLinux/thrift,apache/thrift,apache/thrift,eamosov/thrift