D6992: Fix build on Linux without X11

[Volker Krause]

vkrause added a comment.


  It's going to call getenv("") and then continue with the empty display variable case for non-X11 below. At least that's the assumption, an entirely X11-free setup is still somewhat theoretical at this point :)
  My goal for now is to make the KF5 Yocto recipes useful in a non-X11/pure Wayland setup, kcrash matters there due to being a wide-spread (indirect) dependency.

REPOSITORY
  R285 KCrash

REVISION DETAIL
  https://phabricator.kde.org/D6992

To: vkrause, #frameworks, bshah, graesslin
Cc: dfaure, graesslin, bshah
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