@check decorator not properly handling exceptions

[tisdall]

from watchman.decorators import check

@check
def my_check():
    raise Exception("test")

gives the following traceback (Django 2.2.4, python 3.6.7) :

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python3.6/contextlib.py", line 52, in inner
    return func(*args, **kwds)
  File "/usr/local/lib/python3.6/contextlib.py", line 52, in inner
    return func(*args, **kwds)
  File "/usr/local/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/watchman/decorators.py", line 107, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/watchman/views.py", line 163, in dashboard
    for outer_status in value:
TypeError: 'bool' object is not iterable

[tisdall]

It seems this may be answered by a previous message I sent: https://github.com/mwarkentin/django-watchman/issues/77#issuecomment-215173249

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[mwarkentin]

Closing as I've provided a proper way to write custom checks in the docs in #190.