🐛 FIX NoURI error in doc reference resolution

[chrisjsewell]

closes #733

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (585ce9a) 89.95% compared to head (2574cd2) 89.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #734      +/-   ##
==========================================
+ Coverage   89.95%   89.96%   +0.01%     
==========================================
  Files          23       23              
  Lines        2967     2970       +3     
==========================================
+ Hits         2669     2672       +3     
  Misses        298      298              

Flag	Coverage Δ
pytests	89.96% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
myst_parser/sphinx_ext/myst_refs.py	88.95% <100.00%> (+0.18%)	⬆️

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