Fix LT-14897: "Try a Word" cast issue

Andy Black fixed the first part of this bug,
and this is the second part of the fix.
Seems the allomorph can also be a stem, not just an affix.

I also threw in a second fix for 'free',
when an entry had no senses at all.

Change-Id: I86e7a098f29f8194695f70752f550558343b99f7