Avoid crash in KWin on Session leave

BUG: 420077

  • hunk of original commit e8a1f8ec seems was lost during a94be708 merge, so restoring it again
  • add missing check

Original Differential Revision: https://phabricator.kde.org/D28889

Blocks: !38 (merged)

Edited by Andrey Butirsky

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