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Fix content pack extractor validation #2697
As described in #2663, applying content packs with a Grok or JSON extractors fail in the current master, as their
This PR fixes the validation of those extractors, and also adds a couple of cosmetic changes around it: corrects a typo in the logged error when the content pack could not be applied, and shows an error in the web interface if the content pack provided by the user could not be imported (i.e. is not valid JSON).