fix digitalocean spaces fetch

[benitogf]

related to #465

#506

[Acconut]

Thank you for this PR, but I don´t think I fully understand its purpose. What was the error from DigitalOcean Spaces? How does this PR fix this and why is the info.Size > 0 check needed?

[benitogf]

Hello, the error from DigitalOcean spaces is that it returns NoSuchKey instead of NoSuchUpload on the condition described by the comment above the check when the multipart upload has already been completed or aborted

Will remove the info.Size > 0 check since its already here

tusd/pkg/handler/unrouted_handler.go

Line 751 in 0ad435b

if info.Offset == 0 {

[Acconut]

Thank you very much for the explanation and the PR!