apply_neighborhood does not handle overlap as optional argument

[kvantricht]

While the apply_neighborhood process should have overlap as an optional argument, it is implemented as a required argument here.

This leads to the following error when overlap is not provided in the python client:

File "/opt/venv/lib64/python3.8/site-packages/openeo_driver/ProcessGraphDeserializer.py", line 1522, in apply_process
    return process_function(args=ProcessArgs(args, process_id=process_id), env=env)
  File "/opt/venv/lib64/python3.8/site-packages/openeo_driver/ProcessGraphDeserializer.py", line 692, in apply_neighborhood
    return data_cube.apply_neighborhood(process=process, size=size, overlap=overlap, env=env, context=context)
  File "/opt/venv/lib64/python3.8/site-packages/openeo_driver/dry_run.py", line 702, in apply_neighborhood
    overlap_dict = {e['dimension']: e for e in overlap}
TypeError: 'NoneType' object is not iterable

[soxofaan]

current workaround is to provide an empty list []