Commands.addId: used partial functions 'head' and 'read', now it's safer.
Commands.addId: used partial functions 'head' and 'read', now it's safer.

darcs-hash:20080222123827-87dc9-37c14722f611335ad6267e1e9ce910d66eaefb92.gz

beni55/libmpd-haskell,sol/libmpd-haskell