The carbon footprint KP is unexpectedly empty sometimes

[teolemon]

          I've finally found the issue and it's because of the carbon footprint KP.

On the website, it's empty:

And I have a fix for the app to have the same thing:

But is-it the real fix that we want? (what's the goal of an empty KP)

Cc @teolemon / @stephanegigandet

Originally posted by @g123k in openfoodfacts/smooth-app#4948 (comment)

[stephanegigandet]

json_debug_url: "https://static.openfoodfacts.org/srv/off/html/files/debug/knowledge_panels//carbon_footprint.3760296730100.json",
json_error: ", or } expected while parsing object/hash, at character offset 810 (before "coeur de march\x{c3}...") at /srv/off/lib/ProductOpener/KnowledgePanels.pm line 352.
",