D20722: ViewSpace: Don't ASSERT, just check for valid doc to remove from tab

[loh tar]

loh.tar added a comment.


  hm, can't say much helpful to your patch. Send you my BT. 
  But from my point of view is this assert here redundant. When you dislike my check, you can drop the assert anyway.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D20722

To: loh.tar, #kate, dhaumann
Cc: cullmann, kwrite-devel, #kate, domson, michaelh, ngraham, demsking, sars, dhaumann
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