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Fills the log when /dev/tty4 is not present

Like this:

Sep 19 17:07:54 pureos systemd[964]: Started Hægtesse, a daemon for voice call audio.
Sep 19 17:07:54 pureos unknown[1392]: Error opening port `/dev/ttyUSB4': No such file or directory
Sep 19 17:07:54 pureos systemd[964]: haegtesse.service: Main process exited, code=exited, status=1/FAILURE
Sep 19 17:07:54 pureos systemd[964]: haegtesse.service: Failed with result 'exit-code'.
Sep 19 17:07:54 pureos systemd[964]: haegtesse.service: Service RestartSec=500ms expired, scheduling restart.
Sep 19 17:07:54 pureos systemd[964]: haegtesse.service: Scheduled restart job, restart counter is at 93.

Please don't retry if /dev/tty4 is not avialable but rather wait for that device to show up. It would actually be better if activation would be based on the device node.