Add missing raise_for_status() error handling on AS4 submission

[raphaelm]

No description provided.

[arj03]

Hmm, that doesn't look correct. The logic is a bit tricky here, but it appears that if you get not 200, then futher down it tries to make a proper error out of it. With this raise it will bubble up the HTTPError and not give you a sendpeppol error?

[raphaelm]

Hm, you're right, it breaks logic down below, I didn't look far enough. The problem I was running into was a Peppol AP that returned an error 500 with no body, therefore breaking the etree.fromstring() line in a way that said "empty body", which feld less helpful in logs than "error 500"

[raphaelm]

New attempt pushed

[arj03]

Thanks