D5919: Fix crash when closing tabs with search box open

[Elvis Angelaccio]

elvisangelaccio added a comment.


  Bah, I give up. Can't figure out a clean way to fix it.
  At think point I think we can go with @anthonyfieroni's initial fix (i.e. just check if `tabPage` is valid in `DolphinMainWindow::updateSplitAction()`).

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D5919

To: elvisangelaccio, anthonyfieroni, emmanuelp
Cc: #konqueror, #dolphin
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