Error with add_to_builtins

[anonymous]

I use Django with Tornado Web Server. It work like a charm when i start my server direcly with Python.

I converted my project into a standalone exe program with py2exe. Now when i load a webpage i get the following error

ERROR:tornado.application:Uncaught exception, closing connection.
Traceback (most recent call last):
  File "tornado\iostream.pyc", line 354, in wrapper
  File "tornado\stack_context.pyc", line 331, in wrapped
  File "tornado\stack_context.pyc", line 302, in wrapped
  File "tornado\httpserver.pyc", line 328, in _on_headers
  File "tornado\wsgi.pyc", line 251, in __call__
  File "django\core\handlers\wsgi.pyc", line 206, in __call__
  File "django\core\handlers\base.pyc", line 196, in get_response
  File "django\core\handlers\base.pyc", line 231, in handle_uncaught_exception
  File "django\views\debug.pyc", line 69, in technical_500_response
  File "django\views\debug.pyc", line 322, in get_traceback_html
  File "django\template\base.pyc", line 125, in __init__
  File "django\template\base.pyc", line 152, in compile_string
  File "django\template\debug.pyc", line 35, in __init__
  File "django\template\base.pyc", line 239, in __init__
  File "django\template\base.pyc", line 353, in add_library
AttributeError: 'NoneType' object has no attribute 'tags'
ERROR:tornado.application:Exception in callback <functools.partial object at 0x0
3658DB0>
Traceback (most recent call last):
  File "tornado\ioloop.pyc", line 477, in _run_callback
  File "tornado\stack_context.pyc", line 331, in wrapped
  File "tornado\stack_context.pyc", line 302, in wrapped
  File "tornado\iostream.pyc", line 354, in wrapper
  File "tornado\stack_context.pyc", line 331, in wrapped
  File "tornado\stack_context.pyc", line 302, in wrapped
  File "tornado\httpserver.pyc", line 328, in _on_headers
  File "tornado\wsgi.pyc", line 251, in __call__
  File "django\core\handlers\wsgi.pyc", line 206, in __call__
  File "django\core\handlers\base.pyc", line 196, in get_response
  File "django\core\handlers\base.pyc", line 231, in handle_uncaught_exception
  File "django\views\debug.pyc", line 69, in technical_500_response
  File "django\views\debug.pyc", line 322, in get_traceback_html
  File "django\template\base.pyc", line 125, in __init__
  File "django\template\base.pyc", line 152, in compile_string
  File "django\template\debug.pyc", line 35, in __init__
  File "django\template\base.pyc", line 239, in __init__
  File "django\template\base.pyc", line 353, in add_library
AttributeError: 'NoneType' object has no attribute 'tags'

To fix that problem I add a condition in add_to_builtins. This add_to_builtins: ​https://github.com/django/django/blob/master/django/template/base.py#L1353

My add_to_builtins :

def add_to_builtins(module):
    mod_imported = import_library(module)
    if mod_imported != None :
        builtins.append(mod_imported)

Don't know if I fix that problem by the right way but that work for me.

[Tim Graham]

I'm concerned that the fix may be hiding an actual problem with your project. Can you check what the attempted imported module name is when None is added to builtins?