Time comparison to 'never' fails for admin update notification

[sheagcraig]

Describe the bug Sal UI dies trying to compare 'never' to a float epoch time.

Traceback:

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner

39. response = get_response(request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _legacy_get_response

249. response = self._get_response(request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response

187. response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response

185. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/usr/local/lib/python3.6/site-packages/django/contrib/auth/decorators.py" in _wrapped_view

23. return view_func(request, *args, **kwargs)

File "/home/docker/sal/server/views.py" in index

79. context.update(utils.check_version())

File "/home/docker/sal/server/utils.py" in check_version

170. if current_time > next_notify_date:

Exception Type: TypeError at / Exception Value: '>' not supported between instances of 'float' and 'str'

Example values: current_time: 1544108664.4966092 next_notify_date: 'never'

To Reproduce Steps to reproduce the behavior:

1. Possibly not an issue on other versions; certainly an issue on the 4.0 branch...
2. New version is available.
3. "never" is chosen as the remind me option.
4. Try to view something.

Expected behavior You're not nagged again until the next version and the site works correctly.

Server (please complete the following information):

• Docker, py3/sal 4 branch

[sheagcraig]

Fixed by #305