old_contents: # -*- coding: utf-8 -*-
  import threading
  
  import six
  from django.core.handlers.wsgi import WSGIHandler
  
  tld = threading.local()
  
  
  def null_technical_500_response(request, exc_type, exc_value, tb, status_code=500):
      """Function to override django.views.debug.technical_500_response.
  
      Django's convert_exception_to_response() wrapper is called on each 'Middleware' object to avoid
      leaking exceptions. If and uncaught exception is raised, the wrapper calls technical_500_response()
      to create a response for django's debug view.
  
      Runserver_plus overrides the django debug view's technical_500_response() function to allow for
      an enhanced WSGI debugger view to be displayed. However, because Django calls
      convert_exception_to_response() on each object in the stack of Middleware objects, re-raising an
      error quickly pollutes the traceback displayed.
  
      Runserver_plus only needs needs traceback frames relevant to WSGIHandler Middleware objects, so
      only store the traceback if it is for a WSGIHandler. If an exception is not raised here, Django
      eventually throws an error for not getting a valid response object for its debug view.
      """
  
      # Store the most recent tb for WSGI requests. The class can be found in the second frame of the tb
      if isinstance(tb.tb_next.tb_frame.f_locals['self'], WSGIHandler):
          tld.wsgi_tb = tb
  
      elif tld.wsgi_tb:
          tb = tld.wsgi_tb
  
      six.reraise(exc_type, exc_value, tb)
  
new_contents: # -*- coding: utf-8 -*-
  import threading
  
  import six
  from django.core.handlers.wsgi import WSGIHandler
  
  tld = threading.local()
  
  
  def null_technical_500_response(request, exc_type, exc_value, tb, status_code=500):
      """Function to override django.views.debug.technical_500_response.
  
      Django's convert_exception_to_response() wrapper is called on each 'Middleware' object to avoid
      leaking exceptions. If and uncaught exception is raised, the wrapper calls technical_500_response()
      to create a response for django's debug view.
  
      Runserver_plus overrides the django debug view's technical_500_response() function to allow for
      an enhanced WSGI debugger view to be displayed. However, because Django calls
      convert_exception_to_response() on each object in the stack of Middleware objects, re-raising an
      error quickly pollutes the traceback displayed.
  
      Runserver_plus only needs needs traceback frames relevant to WSGIHandler Middleware objects, so
      only store the traceback if it is for a WSGIHandler. If an exception is not raised here, Django
      eventually throws an error for not getting a valid response object for its debug view.
      """
  
      try:
          # Store the most recent tb for WSGI requests. The class can be found in the second frame of the tb
          if isinstance(tb.tb_next.tb_frame.f_locals['self'], WSGIHandler):
              tld.wsgi_tb = tb
          elif tld.wsgi_tb:
              tb = tld.wsgi_tb
      except AttributeError:
          pass
  
      six.reraise(exc_type, exc_value, tb)
  
subject: Check for AttributeError