
This patch fixes the problems below: 1. flavor.unset_keys() is not checked in flavor unit tests. So check them in the tests. 2. test_flavor_unset_no_project makes no sense. It is OK to specify ``--project ''`` without raising any exception. It can pass because in the test, we set nither project nor property. So remove this test. Change-Id: I04e537349936343b6d8c85b06bc6d0ba6bd41d6f