Runserver Issue with Django 3.6.x - middleware being None

[chayim]

Had an issue where middleware wasn't honoured in django 3.6.3. Stock install from pypi fails with the error below. This fixes that.

Traceback (most recent call last):
File "./manage.py", line 10, in
execute_from_command_line(sys.argv)
File "/home/chayim/.venvs/python/3.6.3.siemphony.core.master/lib/python3.6/site-packages/django/core/management/init.py", line 364, in execute_from_command_line
utility.execute()
File "/home/chayim/.venvs/python/3.6.3.siemphony.core.master/lib/python3.6/site-packages/django/core/management/init.py", line 356, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/chayim/.venvs/python/3.6.3.siemphony.core.master/lib/python3.6/site-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/chayim/.venvs/python/3.6.3.siemphony.core.master/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 62, in execute
super(Command, self).execute(*args, **options)
File "/home/chayim/.venvs/python/3.6.3.siemphony.core.master/lib/python3.6/site-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/home/chayim/.venvs/python/3.6.3.siemphony.core.master/lib/python3.6/site-packages/django_pdb/management/commands/runserver.py", line 62, in handle
if middlware is None: