Replication: No Error/Wrong error when receiver misses lz4c

During setup of replication, if the receiving end doesn't have the binary lz4c (but the according compression was enabled), I might get a few delayed alerts along the lines of

Failed: ssh_exchange_identification: Connection closed by remote host

but to see the actual error I have to look in the temporary logfile that autorepl.py creates:

/usr/bin/env: „lz4c“: Datei oder Verzeichnis nicht gefunden
cannot receive: failed to read from stream
Failed to write to stdout: Broken pipe

I think the error should be shown directly in the alert.