add exception to be raised in readI32.
add exception to be raised in readI32.

when the client disconnect, server will still try a readMessageBegin,
which will issue a readI32 method call and cause TTransportException
with type END_OF_FILE raised.
We should handle that situation

keitheis/thriftpy,duydb2/thriftpy,dan-blanchard/thriftpy,eleme/thriftpy,OctavianLee/thriftpy,mariusvniekerk/thriftpy,dan-blanchard/thriftpy,duydb2/thriftpy,importcjj/thriftpy,maralla/thriftpy,misakwa/thriftpy,adsharma/flattools,itnihao/thriftpy,halfcrazy/thriftpy,adsharma/flattools,OctavianLee/thriftpy,importcjj/thriftpy,misakwa/thriftpy,spladug/thriftpy,itnihao/thriftpy,mariusvniekerk/thriftpy,adsharma/flattools,keitheis/thriftpy,maralla/thriftpy,itnihao/thriftpy,duydb2/thriftpy,spladug/thriftpy,eleme/thriftpy,halfcrazy/thriftpy,mariusvniekerk/thriftpy,misakwa/thriftpy,maralla/thriftpy,OctavianLee/thriftpy