Fix nextfkey test; it requires a specific (small) database to work properly.  Will error out if database is not appropriate.
Fix nextfkey test; it requires a specific (small) database to work properly.  Will error out if database is not appropriate.

(cherry picked from commit 342d8ada3c0acbb932ef27a1f959b89672ab4025)

MarcNo/lifelines,MarcNo/lifelines,MarcNo/lifelines,MarcNo/lifelines