Change in vdsm[master]: vm: graphics: handle missing displayNetwork

[Code Review]

From Dan Kenigsberg :

Dan Kenigsberg has posted comments on this change.

Change subject: vm: graphics: handle missing displayNetwork
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Patch Set 1:

(1 comment)

https://gerrit.ovirt.org/#/c/74976/1/lib/vdsm/virt/vmdevices/graphics.py
File lib/vdsm/virt/vmdevices/graphics.py:

PS1, Line 63: display_network
as Sahina reported, this expoldes if displayNetwork is None.