Utilizes assertIsNone and assertIsNotNone - tests/etc

Using assertTrue and the 'is None' operator to test if an element is None
is too python2.4. Our unit testing framework 'testtools' supports
assertIsNone and assertIsNotNone, included from python 2.7,
which were created for these types of tests.

Change-Id: If3824356ddf4e6e2d91f6bc2fbfa41946d8463cc
Merge "Utilizes assertIsNone and assertIsNotNone - tests/etc"