don't add a Validation type to the error enum if the protocol being generated alredy defines one
don't add a Validation type to the error enum if the protocol being generated alredy defines one

mthjones/rusoto,ford-prefect/rusoto,mthjones/rusoto,rusoto/rusoto,mattico/rusoto,noggleboggle/rusoto,SecurityInsanity/rusoto,ford-prefect/rusoto,mattico/rusoto,rusoto/rusoto,SecurityInsanity/rusoto,DualSpark/rusoto,DualSpark/rusoto,DualSpark/rusoto,DualSpark/rust-aws,DualSpark/rust-aws,rusoto/rusoto,indiv0/rusoto,mattico/rusoto,DualSpark/rust-aws,cmsd2/rusoto