tree 01f72bc5a03c0b22a87af3755e2e1ab3bf2d81d0
parent 336a68cb490c09eb097be0619e3e28f5f9d101d5
author Alessandro Ghedini <alessandro@ghedini.me> 1594939500 +0100
committer Alessandro Ghedini <alessandro@ghedini.me> 1594973494 +0100

don't try to create ACK frames if there is nothing to ack

This is a regression introduced by 74458c6db64aa50b01314ac8a2fa3e2394c7965c.

We need to check that there are outstanding packets that need to be
acked before trying to create an ACK frame, otherwise a panic is
triggered when the frame is serialized.