Server error on YAML scanner error in admin

```
Internal Server Error: /admin/course/flowruleexception/3454/change/

ScannerError at /admin/course/flowruleexception/3454/change/
while scanning a simple key
in "", line 7, column 1:
max_points:20
^
could not find expected ':'
in "", line 7, column 14:
max_points:20
^

Request Method: POST
Request URL: https://relate.cs.illinois.edu/admin/course/flowruleexception/3454/change/
Django Version: 2.0.13
Python Executable: /usr/bin/uwsgi-core
Python Version: 3.7.2
Python Path: ['/home/andreas/relate/saml-config/attribute-maps', '.', '', '/usr/lib/python37.zip',
'/usr/lib/python3.7', '/usr/lib/python3.7/lib-dynload',
'/home/andreas/my-relate-env3/lib/python3.7/site-packages', '/home/andreas/relate']
Server time: Mi, 3 Apr 2019 10:20:40 -0500
Installed Applications:
('django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'crispy_forms',
'jsonfield',
'bootstrap3_datetime',
'django_select2',
'django_celery_results',
'accounts',
'course',
'djangosaml2')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'course.auth.ImpersonateMiddleware',
'course.utils.FacilityFindingMiddleware',
'course.exam.ExamFacilityMiddleware',
'course.exam.ExamLockdownMiddleware',
'relate.utils.MaintenanceMiddleware')

Traceback:

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/core/handlers/exception.py" in inner
35. response = get_response(request)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response
128. response = self.process_exception_by_middleware(e, request)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/core/handlers/base.py" in _get_response
126. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/contrib/admin/options.py" in wrapper
575. return self.admin_site.admin_view(view)(*args, **kwargs)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapped_view
142. response = view_func(request, *args, **kwargs)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/views/decorators/cache.py" in
_wrapped_view_func
44. response = view_func(request, *args, **kwargs)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/contrib/admin/sites.py" in inner
223. return view(request, *args, **kwargs)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/contrib/admin/options.py" in change_view
1557. return self.changeform_view(request, object_id, form_url, extra_context)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapper
62. return bound_func(*args, **kwargs)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/utils/decorators.py" in _wrapped_view
142. response = view_func(request, *args, **kwargs)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/utils/decorators.py" in bound_func
58. return func.__get__(self, type(self))(*args2, **kwargs2)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/contrib/admin/options.py" in changeform_view
1451. return self._changeform_view(request, object_id, form_url, extra_context)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/contrib/admin/options.py" in
_changeform_view
1483. if form.is_valid():

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/forms/forms.py" in is_valid
179. return self.is_bound and not self.errors

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/forms/forms.py" in errors
174. self.full_clean()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/forms/forms.py" in full_clean
378. self._post_clean()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/forms/models.py" in _post_clean
401. self.instance.full_clean(exclude=exclude, validate_unique=False)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/db/models/base.py" in full_clean
1144. self.clean_fields(exclude=exclude)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/db/models/base.py" in clean_fields
1186. setattr(self, f.attname, f.clean(raw_value, self))

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/django/db/models/fields/__init__.py" in clean
606. value = self.to_python(value)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yamlfield/fields.py" in to_python
22. return yaml.load(value, OrderedLoader)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/__init__.py" in load
114. return loader.get_single_data()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/constructor.py" in get_single_data
41. node = self.get_single_node()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/composer.py" in get_single_node
36. document = self.compose_document()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/composer.py" in compose_document
55. node = self.compose_node(None, None)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/composer.py" in compose_node
84. node = self.compose_mapping_node(anchor)

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/composer.py" in compose_mapping_node
127. while not self.check_event(MappingEndEvent):

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/parser.py" in check_event
98. self.current_event = self.state()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/parser.py" in parse_block_mapping_key
428. if self.check_token(KeyToken):

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/scanner.py" in check_token
116. self.fetch_more_tokens()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/scanner.py" in fetch_more_tokens
173. return self.fetch_stream_end()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/scanner.py" in fetch_stream_end
377. self.remove_possible_simple_key()

File "/home/andreas/my-relate-env3/lib/python3.7/site-packages/yaml/scanner.py" in remove_possible_simple_key
319. "could not find expected ':'", self.get_mark())

Exception Type: ScannerError at /admin/course/flowruleexception/3454/change/
Exception Value: while scanning a simple key
in "", line 7, column 1:
max_points:20
^
could not find expected ':'
in "", line 7, column 14:
max_points:20
^
Request information:
USER: andreas
```