Benedict Aas 0f2cba38d1 fix: allow undefined drives and images in DriveConstraintsModel (#1016)
Currently the `DriveConstraintsModel` errors when given an `undefined`
drive, or image; this commit changes that behaviour. Comes with tests.

Signed-off-by: Juan Cruz Viotti <jviotti@openmailbox.org>
2017-01-13 18:14:09 -04:00
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