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

[loh tar]

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REVISION SUMMARY
  The same ASSERT is done in removeTab(..) but at this point here was observed that it could happens, e.g. while session restore

REPOSITORY
  R40 Kate

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

AFFECTED FILES
  kate/kateviewspace.cpp

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