TypeError when creating IPAddress with prefix of /0

[jathanism]

Environment

• Python version: 3.6+
• Nautobot version: beta4 (develop)

Steps to Reproduce

1. Go to add new IP Address
2. Fill out IP w/ /0 prefix (e.g. 10.11.12.0/0) + status
3. Click "Create"

Expected Behavior

Should fail validation as /0 is not permitted for IP addresses.

Observed Behavior

• Object gets created, but repr isNone as address and causes TypeError to be raised in detail view
• Form validation seems to be failing for this condition

Traceback

TypeError: unexpected type <class 'NoneType'> for addr arg
  File "django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "nautobot/utilities/views.py", line 94, in dispatch
    return super().dispatch(request, *args, **kwargs)
  File "django/views/generic/base.py", line 98, in dispatch
    return handler(request, *args, **kwargs)
  File "nautobot/core/views/generic.py", line 88, in get
    **self.get_extra_context(request, instance),
  File "nautobot/ipam/views.py", line 588, in get_extra_context
    Prefix.objects.restrict(request.user, "view")
  File "nautobot/ipam/querysets.py", line 61, in net_contains_or_equals
    prefix = netaddr.IPNetwork(prefix)
  File "netaddr/ip/__init__.py", line 942, in __init__
    value, prefixlen = parse_ip_network(module, addr,
  File "netaddr/ip/__init__.py", line 831, in parse_ip_network
    raise TypeError('unexpected type %s for addr arg' % type(addr))