Accessing obsolete documentation page throws an exception

[Tim Graham]

Accessing an old version of the documentation like ​https://docs.djangoproject.com/en/1.2/faq/install/ causes an exception:

IOError: [Errno 2] No such file or directory: Path('/home/www/www/data/docbuilds/en/1.2/_built/json/globalcontext.json')

I think we should return HTTP 410 ("Gone") instead of a 500 page.

[Ola Sitarska]

PR: ​https://github.com/django/djangoproject.com/pull/137

[Tim Graham]

As I was reviewing the PR and code, I realized this is because the docbuilds directory on the server contains a checkout for 1.2, but the docs build doesn't work. After deleting that directory, the docs for 1.2 404 as expected. The checkout won't be recreated because the DocumentRelease for 1.2 has been deleted. So I think we can resolve this without any code changes.