[syslog-ng] exclude empty pairs from json-parser()

[Nik Ambrosch]

Hi - I'm trying to figure out how to instruct json-parser() to exclude
empty (or nonexistent) json pairs from being passed to it's template.  This
is possible with the csv parser using null("") but not json.

It seems that if i specify all my json-parser() pairs using --pair
example=\"${MYMACRO}\" the desired behavior is achieved, however using
--scope nv-pairs instead will log the empty values.
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