I am attaching a revised version of the patch which also includes some tests.  Interestingly, the issue in syslog module is a regression from 3.1 introduced in r80401.  Although it is not a crasher, I don't think it was intentional because although openlog() is happy to accept NULL for indent, the error from  _PyUnicode_AsString() would have to be cleared if the intent was to ignore undecodable indent.