notify: be more defensive aboute None values
encoding.strtolocal is the identity function on Python 2
but an actual string manipulation routine on Python 3.
In some cases, we were passing None, which caused Python 3
to barf.
Let's change the code to react properly when the value is
None.
Differential Revision: https://phab.mercurial-scm.org/D5713
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).