DISPATCH-1333: fix for python3 and object containing unicode check mark
DISPATCH-1333: fix for python3 and object containing unicode check mark

Casting as str() gets the test to pass but clobbers the unicode aspect.
This test passes when 'out' contains 4kb of data and when 'out' is empty.

ErnieAllen/qpid-dispatch,apache/qpid-dispatch,mgoulish/qpid-dispatch,ChugR/qpid-dispatch,apache/qpid-dispatch,bhardesty/qpid-dispatch,ganeshmurthy/qpid-dispatch,bhardesty/qpid-dispatch,apache/qpid-dispatch,bhardesty/qpid-dispatch,ganeshmurthy/qpid-dispatch,ChugR/qpid-dispatch,apache/dispatch,kgiusti/dispatch,kgiusti/dispatch,mgoulish/qpid-dispatch,bhardesty/qpid-dispatch,ChugR/qpid-dispatch,ganeshmurthy/qpid-dispatch,ted-ross/qpid-dispatch,ted-ross/qpid-dispatch,ChugR/qpid-dispatch,bhardesty/qpid-dispatch,ted-ross/qpid-dispatch,ChugR/qpid-dispatch,ted-ross/qpid-dispatch,ErnieAllen/qpid-dispatch,apache/dispatch,apache/dispatch,bhardesty/qpid-dispatch,ganeshmurthy/qpid-dispatch,ted-ross/qpid-dispatch,mgoulish/qpid-dispatch,kgiusti/dispatch,ganeshmurthy/qpid-dispatch,apache/dispatch,apache/dispatch,apache/qpid-dispatch,kgiusti/dispatch,apache/dispatch,ErnieAllen/qpid-dispatch,mgoulish/qpid-dispatch,bhardesty/qpid-dispatch,kgiusti/dispatch,ErnieAllen/qpid-dispatch,ChugR/qpid-dispatch,mgoulish/qpid-dispatch,apache/qpid-dispatch,kgiusti/dispatch,apache/qpid-dispatch,apache/dispatch,ErnieAllen/qpid-dispatch,ted-ross/qpid-dispatch,ErnieAllen/qpid-dispatch,ganeshmurthy/qpid-dispatch,mgoulish/qpid-dispatch