Fedor Sumkin 8a9865cb10 Fix for dns4 empty setting (#30757) ...

This fix check if DNS4 is None or not before proceeding with
other operations. Also, added unit test for this change.

Signed-off-by: Fedor Sumkin <qosys.net@gmail.com>
Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

2017-12-20 12:48:22 +05:30

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