#246 Assure that API requests always respond with json
Closed: Fixed by t0xic0der. Opened by puiterwijk.

Currently, a 500 server error on the API requests page will still return HTML.
We should make sure that this also return a valid json object.


Metadata Update from @puiterwijk:
- Custom field component adjusted to OpenID Connect
- Custom field type adjusted to defect
- Custom field version adjusted to Development

Metadata Update from @t0xic0der:
- Issue close_status updated to: Fixed
- Issue status updated to: Closed (was: Open)

Metadata