Fix #6136: :name: option for math directive causes a crash

[tk0miya]

Feature or Bugfix

• Bugfix

Purpose

• refs: :name: option for math causes a crash #6136

[codecov]

Codecov Report

Merging #6137 into 1.8 will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              1.8    #6137      +/-   ##
==========================================
- Coverage   82.14%   82.14%   -0.01%     
==========================================
  Files         301      301              
  Lines       40323    40325       +2     
  Branches     6231     6231              
==========================================
+ Hits        33124    33125       +1     
  Misses       5819     5819              
- Partials     1380     1381       +1

Impacted Files	Coverage Δ
sphinx/directives/patches.py	91.57% <100%> (+0.18%)	⬆️
sphinx/builders/html.py	82.85% <0%> (-0.1%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update be971c6...346d33b. Read the comment docs.