filter_list getObjects(None)

[will-moore]

Reported at https://www.openmicroscopy.org/qa2/qa/feedback/29402/

File "/opt/omero/web/venv3/lib/python3.6/site-packages/omero_parade/views.py", line 114, in filter_list
filters.extend(module.get_filters(request, conn))

File "/opt/omero/web/venv3/lib/python3.6/site-packages/omero_parade/csv_filters/omero_filters.py", line 53, in get_filters
csv_anns = get_csv_annotations(conn, obj_type, obj_id)

File "/opt/omero/web/venv3/lib/python3.6/site-packages/omero_parade/csv_filters/data_providers.py", line 34, in get_csv_annotations
obj = conn.getObject(obj_type, obj_id)

File "/opt/omero/web/venv3/lib/python3.6/site-packages/omero/gateway/__init__.py", line 3268, in getObject
obj_type, oids, params, attributes, opts)

File "/opt/omero/web/venv3/lib/python3.6/site-packages/omero/gateway/__init__.py", line 3349, in buildQuery
"'Image' not %r" % obj_type)

AttributeError: getObjects uses a string to define obj_type, E.g. 'Image' not None