Role referenced before assignment

[LincolnBryant]

2023-11-13 10:37:24,260;app;log_exception;ERROR;Exception on /jupyterlab [GET]
Traceback (most recent call last):
  File "/usr/local/af-portal/venv/lib64/python3.6/site-packages/flask/app.py", line 2073, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/af-portal/venv/lib64/python3.6/site-packages/flask/app.py", line 1518, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/af-portal/venv/lib64/python3.6/site-packages/flask/app.py", line 1516, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/af-portal/venv/lib64/python3.6/site-packages/flask/app.py", line 1502, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "./portal/decorators.py", line 176, in inner
    return render_template('request_membership.html', role=role)
UnboundLocalError: local variable 'role' referenced before assignment

Seems to be because the role variable only exists in the scope of the if profile block here: https://github.com/maniaclab/af-portal/blob/main/portal/decorators.py#L160-L177

Probably we should render a page telling the user there was a problem getting profile information in that case, and ask them to try again.