Distribution/NixOS/Derivation/Cabal.hs: don't fail with 'error' when the version string can't be parsed
Distribution/NixOS/Derivation/Cabal.hs: don't fail with 'error' when the version string can't be parsed

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