Fix retrieving oauth2 params from body #1853
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Summary
There is an issue when you supply a JSON request with an empty body to the OAuth2 plugin.
As the body is deemed to be 'nil' the JSON decode function does not like this (as it expects a string) and throws.
Issues resolved
This commit short circuits the retrieval process if the request method is GET or HEAD (as these do not provide bodies), and in the event that no body is supplied in another request type it provides a default empty JSON object to satisfy the decode process.