[postprocessors]how to not create file when keyword not exists

[maplestory03]

 "postprocessors": [
        {
            "name": "metadata",
            "event": "post",
            "filename": "00_{category}/{gid}/{token}.url",
            "mode": "custom",
            "content-format": ["[InternetShortcut]\nURL=https://{category}.org/g/{gid}/{token}"]
        },
         {
            "name": "metadata",
            "event": "post",
            "filename": "00_{category}_{title}.url",
            "mode": "custom",
            "content-format": ["[InternetShortcut]\nURL=https://{category}.org/g/{gid}/{token}"]
        },
        {
            "name": "metadata",
            "event": "post",
            "filename": "00_{category}_{title_jpn}.url",
            "mode": "custom",
            "content-format": ["[InternetShortcut]\nURL=https://{category}.org/g/{gid}/{token}"]
        }
    ]

create file when "title_jpn" exists, do not create file when "title_jpn" not exists
this way will create if title_jpn not exists: 00_{category}_.url
how to fix it?

[Hrxn]

You can use the "filter" option in a post-processor.

        {
            "name": "metadata",
            "event": "post",
            "filename": "00_{category}_{title_jpn}.url",
            "mode": "custom",
            "content-format": ["[InternetShortcut]\nURL=https://{category}.org/g/{gid}/{token}"],

            "filter": "locals().get('title_jpn')"
        }

This post-processor should only run if "title_jpn" exists.

[maplestory03]

You can use the "filter" option in a post-processor.

        {
            "name": "metadata",
            "event": "post",
            "filename": "00_{category}_{title_jpn}.url",
            "mode": "custom",
            "content-format": ["[InternetShortcut]\nURL=https://{category}.org/g/{gid}/{token}"],

            "filter": "locals().get('title_jpn')"
        }

This post-processor should only run if "title_jpn" exists.

works ,thank you