Error when updating ServiceIntegration for prometheus integration

[mortenlj]

Creating a service integration of type prometheus works fine, the integration is connected and seems to be working.
If I attempt to make a change, the operator fails with an error:

ERROR	Reconciler error	{"controller": "serviceintegration", "controllerGroup": "aiven.io", "controllerKind":"ServiceIntegration", "ServiceIntegration": {"name":"opensearch-basseng-documents-prometheus","namespace":"basseng"}, "namespace": "basseng", "name": "opensearch-basseng-documents-prometheus", "reconcileID": "75c85631-6ba4-4190-9142-b4137150b502", "error": "unable to create or update instance at aiven: unable to create or update aiven instance: 400: {\"errors\":[{\"message\":\"Invalid input for user_config 'Service type-specific settings': None is not of type 'object'\",\"status\":400}],\"message\":\"Invalid input for user_config 'Service type-specific settings':None is not of type 'object'\"} - "}

From what I can gather, this is because prometheus integrations doesn't have any user_config, and the operator sends a nil value when calling the API. The API apparently requires that the user_config is an object.
Strangely enough, the API accepts a nil value when creating the service integration, but not when updating it, which might indicate that this could be considered an API bug.