[REVIEW-3-5] Fix for fdo#45177 - crash in Impress outline view

[Thorsten Behrens]

Hi,

couldl someone please review

 http://cgit.freedesktop.org/libreoffice/core/commit/?id=57e6f04066cfddfa79eb2b79cf5c45653c79eff3

and cherry-pick to -3-5? It's not a final solution, since we're
loosing some convenience in outline view undo, but better than a
crash I think.

Cheers,

-- Thorsten
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