'NoneType' object has no attribute 'upper'

[saurabhchandrapatel]

Traceback (most recent call last):
File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
self.result = application(self.environ, self.start_response)
File "/buildenv2/local/lib/python2.7/site-packages/django/contrib/staticfiles/handlers.py", line 63, in call
return self.application(environ, start_response)
File "/buildenv2/local/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 157, in call
response = self.get_response(request)
File "/buildenv2/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 124, in get_response
response = self._middleware_chain(request)
File "/buildenv2/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 43, in inner
response = response_for_exception(request, exc)
File "/buildenv2/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 93, in response_for_exception
response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
File "/buildenv2/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 139, in handle_uncaught_exception
return debug.technical_500_response(request, *exc_info)
File "/buildenv2/local/lib/python2.7/site-packages/django/views/debug.py", line 84, in technical_500_response
html = reporter.get_traceback_html()
File "/buildenv2/local/lib/python2.7/site-packages/django/views/debug.py", line 328, in get_traceback_html
return t.render(c)
File "/buildenv2/local/lib/python2.7/site-packages/django/template/base.py", line 207, in render
return self._render(context)
File "/buildenv2/local/lib/python2.7/site-packages/django/template/base.py", line 199, in _render
return self.nodelist.render(context)
File "/buildenv2/local/lib/python2.7/site-packages/django/template/base.py", line 990, in render
bit = node.render_annotated(context)
File "/buildenv2/local/lib/python2.7/site-packages/django/template/base.py", line 957, in render_annotated
return self.render(context)
File "/buildenv2/local/lib/python2.7/site-packages/django/template/base.py", line 1040, in render
output = self.filter_expression.resolve(context)
File "/buildenv2/local/lib/python2.7/site-packages/django/template/base.py", line 732, in resolve
obj = template_localtime(obj, context.use_tz)
File "/buildenv2/local/lib/python2.7/site-packages/django/utils/timezone.py", line 195, in template_localtime
return localtime(value) if should_convert else value
File "/buildenv2/local/lib/python2.7/site-packages/django/utils/timezone.py", line 213, in localtime
timezone = get_current_timezone()
File "/buildenv2/local/lib/python2.7/site-packages/django/utils/timezone.py", line 97, in get_current_timezone
return getattr(_active, "value", get_default_timezone())
File "/buildenv2/local/lib/python2.7/site-packages/django/utils/lru_cache.py", line 124, in wrapper
result = user_function(*args, **kwds)
File "/buildenv2/local/lib/python2.7/site-packages/django/utils/timezone.py", line 79, in get_default_timezone
return pytz.timezone(settings.TIME_ZONE)
File "/buildenv2/local/lib/python2.7/site-packages/pytz/init.py", line 160, in timezone
if zone.upper() == 'UTC':
AttributeError: 'NoneType' object has no attribute 'upper'
2018-12-07 12:58:11,921 ERROR django.server "GET / HTTP/1.1" 500 59

[stub42]

An invalid timezone name was passed into pytz.timezone. I've updated the code to raise an UnknownTimeZoneError in this case, as documented. This fix will be in the next pytz release (2019*)