made MIME::QuotedPrint::decode more robust against wide chars

I don't fully understand the issue, but the problem was

Tr: Tr: Re: CO NFIRMACI =D3 N DE GANA N CI A‏ $VAR1 = undef;

Wide character in subroutine entry at listadmin line 1248, <FIN> line 115.

The eval seems to ignore errors.