fix error type bug in ecs unit tests
fix error type bug in ecs unit tests

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