Fix issue #4885

[knorth55]

Subject: Fix issue reported in #4885

Feature or Bugfix

• Bugfix

Purpose

• I got same error as Django docs crash with AttributeError: 'DirectiveAdapter' object has no attribute 'env'` #4885 and I want to fix it.

Detail

• self.env is not defined
  • self.env -> env
• modules[modname] is tuple
  • modules[modname] -> modules[modname][0]

Relates

• Django docs crash with AttributeError: 'DirectiveAdapter' object has no attribute 'env'` #4885

[codecov]

Codecov Report

Merging #4887 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4887      +/-   ##
==========================================
+ Coverage   82.17%   82.18%   +<.01%     
==========================================
  Files         286      291       +5     
  Lines       38005    38326     +321     
  Branches     5878     5932      +54     
==========================================
+ Hits        31230    31497     +267     
- Misses       5465     5511      +46     
- Partials     1310     1318       +8

Impacted Files	Coverage Δ
sphinx/domains/python.py	76% <ø> (ø)	⬆️
sphinx/apidoc.py	0% <0%> (ø)
sphinx/errors.py	70% <0%> (ø)
sphinx/search/__init__.py	96% <0%> (ø)
sphinx/quickstart.py	0% <0%> (ø)
sphinx/__init__.py	57.5% <0%> (ø)

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[tk0miya]

Absolutely right.
Thank you for your work!