test01_join(): Fix a test failure when run with "python -O".  The setting of sCursor happened in an assert.
test01_join(): Fix a test failure when run with "python -O".  The
setting of sCursor happened in an assert.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator