Tang Chen 237d7feca8 [Identity] Check return value is None in identity v3 unit tests
take_action() in commands inheriting from Command returns nothing.
So we should assert the return is None in the unit tests of these
commands.

Change-Id: I53eeb88316b2c20882fed97149d55cb04bcb2b2e
Closes-Bug: #1550636
2016-03-09 14:17:05 +08:00
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