Include charge_density in summary has_props

[munrojm]

No description provided.

[codecov-commenter]

Codecov Report

Merging #305 (42e9e5e) into main (210db56) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   90.63%   90.64%   +0.01%     
==========================================
  Files          47       47              
  Lines        2435     2438       +3     
==========================================
+ Hits         2207     2210       +3     
  Misses        228      228              

Impacted Files	Coverage Δ
emmet-core/emmet/core/summary.py	88.39% <ø> (ø)
emmet-builders/emmet/builders/materials/summary.py	96.42% <100.00%> (+0.20%)	⬆️

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[mkhorton]

Thanks!