normalizeList: don't accept "" in a list of strings
normalizeList: don't accept "" in a list of strings

psibi/cabal2nix,bennofs/cabal2nix,dmalikov/cabal2nix,Fuuzetsu/cabal2nix,gridaphobe/cabal2nix,spencerjanssen/cabal2nix,jb55/cabal2nix