Output json field includes reference and matched-line as null

[Ice3man543]

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Please describe your feature request:

Nuclei JSON output contains reference and matched-line with null as value, instead empty cases of these values should be omitted.

Probably custom json marshallers need to be changed along with adding omitempty to the required fields.

[Ice3man543]

@ehsandeep @Mzack9999 the issue here is StringSlice is a custom type and unless it is a pointer go's encoding/json always marshalls and writes null as value ignoring omitempty tags on custom types. To do so would require some extra work so unsure how we want to proceed here.

[Ice3man543]

Marking on-hold as too many changes required which doesn't seem worth it at this point.

[ehsandeep]

Closing as per the above comment.