FIX: Update vanilla_body_parser for stability (PR #10652)

Updated def rich? function for stability in importing

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The title of this pull request changed from “Update vanilla_body_parser for stability” to "DEV: Update vanilla_body_parser for stability

The title of this pull request changed from “DEV: Update vanilla_body_parser for stability” to "FIX: Update vanilla_body_parser for stability

Hi @rachel-carvalho , can you please review this? If not, who can review this? It’s just a minor fix for the case insensitivity for the operation of parser in vanilla

Thanks, this looks good.