Sending an empty file via "send file to partner" fails

Sending an empty file (= 0 bytes) via "send file to partner" fails.
The AS2 main window displays: "Manual send: null"

Sending the same empty file via outbox directory succeeds without problems.



To be honest: I don't want to send 0 bytes.
This was just an "accidental" finding.
I was suprised that sending the file via "send file to partner" fails,
whereas it succeeds to send it via outbox directory.
I thougth that you might be interested in my finding ... and a consistent behaviour of your software.