fix(syslog): Don't log empty messages
fix(syslog): Don't log empty messages

Signed-off-by: Francisco Miguel Biete <f1d806242fc0bb697f053bcdfc66a36bc885611e@renr.es>

RavenB/Z-Push-contrib,fmbiete/Z-Push-contrib,Freeaqingme/Z-Push-contrib,mta59066/Z-Push-contrib