Presence of simplejson module causes missed Exception

[mgrubent]

Background

As described in psf/requests#4842, when the simplejson module is present, requests preferentially uses this module rather than the json module when executing, among other calls, Response.json().

Problem

Currently, the deprecated display_response function makes a call to response.json(), but then expects the exception, if any, to be a json exception, rather than a simplejson exception

This means that a simplejson exception, if thrown, is uncaught until it passes up to the caller of display_response, which includes json_responder.retrieve_response_from_Endpoint.

Proposal

Either simplejson exceptions should be caught, if it is possible that they will be thrown, or the possibility that they will be thrown should be entirely avoided.