Python 每一页都有Django字体错误

我已经好几个星期没有在我的应用程序上碰过代码了，但是我突然在每个页面上都出现了完全相同的类型错误，包括管理页面

最后一件事是对模型进行更新，以更改ForeignKey字段，但我觉得这两者并不相关

Environment:


Request Method: GET
Request URL: http://10.0.0.161:8001/admin/

Django Version: 1.9.3
Python Version: 2.7.6
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'phones',
 'jobs',
 'profiles',
 'freelancers',
 'stock',
 'finance']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'profiles.middleware.UpdateLastActivityMiddleware']



Traceback:

File "/Users/studioxag/Documents/repos/telephones/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  174.                     response = self.process_exception_by_middleware(e, request)

File "/Users/studioxag/Documents/repos/telephones/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  172.                     response = response.render()

File "/Users/studioxag/Documents/repos/telephones/lib/python2.7/site-packages/django/template/response.py" in render
  160.             self.content = self.rendered_content

File "/Users/studioxag/Documents/repos/telephones/lib/python2.7/site-packages/django/template/response.py" in rendered_content
  137.         content = template.render(context, self._request)

File "/Users/studioxag/Documents/repos/telephones/lib/python2.7/site-packages/django/template/backends/django.py" in render
  95.             return self.template.render(context)

File "/Users/studioxag/Documents/repos/telephones/lib/python2.7/site-packages/django/template/base.py" in render
  204.                 with context.bind_template(self):

File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/contextlib.py" in __enter__
  17.             return self.gen.next()

File "/Users/studioxag/Documents/repos/telephones/lib/python2.7/site-packages/django/template/context.py" in bind_template
  260.             updates.update(processor(self.request))

Exception Type: TypeError at /admin/
Exception Value: 'NoneType' object is not iterable

---

通过查看我自己的一些上下文处理器解决了这个问题。我有一个函数在请求时不返回任何值（在更改了一个条目并且结果是一个空查询集之后）。

太糟糕了，你忘了共享代码我不知道要共享哪些代码位，因为每页都有错误。我会将程序中的每个views.py链接到您吗？