save_origin_webhooks: Fix tests when building debian buster package
Content type sent by django test client on debian buster is equal to 'application/json; charset=None' so tests were failing.
Migrated from D8819 (view on Phabricator)
Content type sent by django test client on debian buster is equal to 'application/json; charset=None' so tests were failing.
Migrated from D8819 (view on Phabricator)