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8b2affbd5b
The conditional + list comprehension in images.py:_split_token()
wasn't quite working as intended; in particular, when fed None,
it chokes with
TypeError: 'NoneType' object is not iterable
This is the correct behavior: comprehensions iterate first,
then apply the conditional.
Solution: special-case None, and remove the now-unnecessary
conditional.
Context: seen when trying 'pypodman run' against
docker.io/stackbrew/centos:7, which has no .ContainerConfig.Eng
Signed-off-by: Ed Santiago <santiago@redhat.com>