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

[loh tar]

loh.tar added a comment.


  Out of the blue run I into this issue.
  The only slightly unusual before was, that I had a confirmation box regarding an unsaved file while quit the session. Then, when I want to restart the same session, it crached always.
  If you like I can submit the BT, but think it's not needed to approve this patch.

REPOSITORY
  R40 Kate

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

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