'No QSOs processed' (exit 8) covers already-uploaded, out-of-certificate-
date-range, and a station callsign that does not match the location being
signed with -- TQSL's message does not say which. An operator whose QSO
was refused and then accepted after a round trip through another logger
is reporting a difference in the record itself, and the temp ADIF is
deleted the moment TQSL returns, so that difference could not be seen.
Logged on any non-zero exit: the record verbatim, the exit code and the
station location. It is QSO data; the key password is not logged.