manage_action_containers TypeError

[will-moore]

QA: bot testing https://www.openmicroscopy.org/qa2/qa/feedback/32630/

Traceback (most recent call last):

File "/opt/omero/web/venv3/lib64/python3.6/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)

File "/opt/omero/web/venv3/lib64/python3.6/site-packages/django/core/handlers/base.py", line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/opt/omero/web/venv3/lib64/python3.6/site-packages/omeroweb/decorators.py", line 538, in wrapped
retval = f(request, *args, **kwargs)

File "/opt/omero/web/venv3/lib64/python3.6/site-packages/omeroweb/decorators.py", line 597, in wrapper
context = f(request, *args, **kwargs)

File "/opt/omero/web/venv3/lib64/python3.6/site-packages/omeroweb/webclient/views.py", line 2857, in manage_action_containers
if o_type is not None and int(o_id) > 0:

TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'