D12716: Check for device not being null

[Albert Astals Cid]

aacid created this revision.
aacid added reviewers: Plasma, jgrulich.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
aacid requested review of this revision.

REVISION SUMMARY
  In almost all places we use NetworkManager::findNetworkInterface we
  later check for the device is not null, do the same here
  
  BUGS: 393707

REPOSITORY
  R116 Plasma Network Management Applet

BRANCH
  Plasma/5.12

REVISION DETAIL
  https://phabricator.kde.org/D12716

AFFECTED FILES
  libs/models/networkmodel.cpp

To: aacid, #plasma, jgrulich
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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