utils: make PID converter lazier

inveniosoftware / invenio-records-rest

Invenio records REST API module.

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

MIT License

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Closed slint closed 4 years ago

slint commented 4 years ago

Makes the PIDConverter lazier in terms of initializing its "resolver" class member, which allows e.g. passing a "record_class" that might depend on application context being loaded.