The problem was the following: setPropertyValue("IsAutoUpdate") on the
style failed -> a number of styles was not imported in
StyleSheetTable::ApplyStyleSheets() due to the exception, then when we
tried to use one of the not imported styles, we also got an exception in
DomainMapper_Impl::finishParagraph(), which resulted in not calling
DomainMapperTableManager::handle(), so multiple cells of the same table
wanted the same range for cell contents, and that resulted in a crash.

Regression from cf33af73 (handle
w:gridBefore by faking cells (fdo#38414), 2014-04-23), but that commit
just made the previously hidden problem visible.

Change-Id: I788cb6b4a2c7b7efbfa48297c658bb26450bf583