D16791: [drm] On update always emit screensQueried

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REVISION SUMMARY
  The screensQueried signal must be emitted also when the output list is empty.
  Otherwise the screen count is not cleared and we might seg fault on the next
  paint cycle.

TEST PLAN
  Resolves a seg fault for me on one of my systems.

REPOSITORY
  R108 KWin

BRANCH
  queryZeroOutputs

REVISION DETAIL
  https://phabricator.kde.org/D16791

AFFECTED FILES
  plugins/platforms/drm/drm_backend.cpp

To: romangg, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart