serializers: drop usage of request.is_xhr for JSON

inveniosoftware / invenio-records-rest

Invenio records REST API module.

https://invenio-records-rest.readthedocs.io

MIT License

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Closed slint closed 6 years ago

slint commented 6 years ago

Drops usage of request.is_xhr since it's deprecated in flask/werkzeug. (closes #204)
Prints pretty JSON in debug mode.