nDepth is only set in ParagraphObj::ImplGetParagraphValues
where the limit is checked, so the checks elsewhere are
unnecessary, and aren't comprehensive anyway

Change-Id: I566335da6b0cf13a76dcb247ad45c8b551af4456
Reviewed-on: https://gerrit.libreoffice.org/64223
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>