Zhongyue Luo d53f1c8570 Utilizes assertIsNone and assertIsNotNone
Using assertTrue and the 'is' operator to test if an element is None
is too python2.4. Our unit testing framework supports
assertIsNone and assertIsNotNone which were created
for these types of tests.

Fixes bug #1230028

Change-Id: Ia58d92c52d0aca9c22360dd44de19d4e5878ab13
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