Just add the messages with debug level, so that they don't get reported at
syslog. Having this kind of warnings in syslog is not useful, specially because
we wouldn't know which was the specific command that issued the warning. Errors
due to critical issues will anyway be reported in syslog in some way or another.
Just remove the last element with NULL strings in the array of errors, as we're
safe using G_N_ELEMENTS() to iterate it.
Reported by Jose Maria Gonzalez Calabozo <jmgonzalezc@indra.es>