Regression from e3b7ef45 which removed
the condition this block was implying, so putting it back here.

This should fix Jenkins_Callgrind tinderbox, we probably should have
some unit tests based on the file from [1] and [2], but I don’t know
how…

1. https://bz.apache.org/ooo/show_bug.cgi?id=89825
2. sw/qa/extras/ww8export/data/tdf91083.odt

Change-Id: I88ad2564908b3a269e95d1969366c8506801818b
Reviewed-on: https://gerrit.libreoffice.org/37050Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>