[REVIEW-3-6] fix related to fdo#52340 , don't crash if cell attribute storage and cond format range get out of sync

[Markus Mohrhard]

Hey,

[1] fixes a crash that happens if in an area where cell storage and
cond format are out of sync, the cells are copied.

I'd like this simple fix in for 3-6 and will try to eliminate all the
cases where they get out of sync for 3-7. These involves such nasty
commits like [2] so I will not ask for backporting all the fixes to
get them in sync.

Regards,
Markus

[1] http://cgit.freedesktop.org/libreoffice/core/commit/?id=10efe1bcedfa450e95cbc3f08642d239ba2ab579
[2] http://cgit.freedesktop.org/libreoffice/core/commit/?id=7222a571d0d458810c1b23871f8b91491db4462d