Based on https://github.com/Open-EO/openeo-usecases/pull/9#issue-494701446:
For optional parameters, empty callbacks should be removed or set to null, depending on what is allowed.
Also, empty process graphs in callback should not prevent from importing a process, but just show a message and proceed the import.
Based on https://github.com/Open-EO/openeo-usecases/pull/9#issue-494701446: For optional parameters, empty callbacks should be removed or set to null, depending on what is allowed. Also, empty process graphs in callback should not prevent from importing a process, but just show a message and proceed the import.