NoneType Error when trying to access Datacube results

[bo-lu]

When trying to access the path:
/collections/canadian-geospatial-platform/items/ccmeo-canadian-wetland-inventory-v3?lang=en

I get the following error:

File "/var/task/pygeoapi/provider/cgp.py", line 219, in _filter_null
for key, val in item.items():
AttributeError: 'NoneType' object has no attribute 'items'

It seems to be coming from:
f2f74b0

Can you please add some Error handling so that the error is properly handled.