[Libreoffice] [REVIEW] cherry-pick to 3-4: crash when modifying a defined name (and other places as well)

Hi, fixes nasty crashers when modifying defined names http://cgit.freedesktop.org/libreoffice/core/commit/?id=792dee46f2b35a21167af182416803c0b80b517c Eike -- PGP/OpenPGP/GnuPG encrypted mail preferred in all private communication. Key ID: 0x293C05FD - 997A 4C60 CE41 0149 0DB3 9E96 2F1A D073 293C 05FD

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