[Dx4win] F8 search bug

[Paul van der Eijk]

I think I squashed the F8 search bug thanks to Rick, K0XB.

When creating a membership list, I did not filter an empty line which
created
an entry for an empty callsign. When starting a filter, the callsign field
is cleared but the membership field was initialized using the empty
callsign (the @ in both cases)

The search failed unless you searched for a callsign in that @ list!

So the quick solution is to recreate your list but watch out for empty
lines.

My new code guards against this happening in the future.

Thank you for your patience,

--Paul, KK4HD