Removes a panic in s3 list_multipart_uploads.
Removes a panic in s3 list_multipart_uploads.

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