Fix errors in ``set/unset flavor`` unit tests

1. We should assert flavor.set_keys() is called correctly
   or not called in ``set flavor`` unit tests.

2. Commit c7e6973ff50ff84af9ad55f7bdaeeea83ae40f0b from me
   removed test_flavor_unset_no_project which used to test
   if --project was specified as '', and assert CommandError
   was raised, which is incorrect. So I removed it. But after
   looking into the code, I think we should not remove it,
   but specify nothing after --project, and assert
   ParserException was raised. So in this patch, we fix it
   as so.

   ('--project', '') --> ('--project')
   assert CommandError --> assert ParserException

Change-Id: Ifd33c72d5b7581aaabffb09e9b5e38ecc67e18c0

0 files changed, 0 insertions, 0 deletions