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

[loh tar]

loh.tar added a comment.


  I'm sorry, I couldn't reproduce the crash to verify your patch. But at least cause it on the first sight no new crash here :-)

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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