Python fix usage of undefined variable
Python fix usage of undefined variable

Summary:
Remove the usage of an undefined variable.
This variable is only used when a Client/Server received a Thrift frame with a wrong version number.

Thanks to Ezra Stuetzel for reporting.

Reviewed By: yfeldblum

Differential Revision: D9669418

fbshipit-source-id: afc40e0eabc3cf8b2b99f126fe1f951d3480e6cc

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift