Utilizes assertIsNone and assertIsNotNone

Using assertEqual/assertNotEqual to test if an element
is or is not None is too python2.4.
Our unit testing framework supports assertIsNone and assertIsNotNone
which were created for these types of tests.

Partial-bug: #1230028

Change-Id: Ie0bddae642f7973ee8b0e00164415f8d87de387e
Merge "Utilizes assertIsNone and assertIsNotNone"