fix #4513 null pointer exception for channel without noarch

[kalefranz]

fix #4513

[codecov-io]

Codecov Report

Merging #4518 into 4.3.x will increase coverage by <.01%.

@@            Coverage Diff             @@
##            4.3.x    #4518      +/-   ##
==========================================
+ Coverage   85.37%   85.37%   +<.01%     
==========================================
  Files          83       83              
  Lines        9813     9815       +2     
==========================================
+ Hits         8377     8379       +2     
  Misses       1436     1436

Impacted Files	Coverage Δ
conda/core/index.py	86.83% <100%> (+1.89%)	✅
conda/connection.py	75.22% <ø> (-1.77%)	❌
conda/cli/main_info.py	81.92% <ø> (-0.56%)	❌
conda/core/path_actions.py	78.91% <ø> (-0.45%)	❌
conda/misc.py	78.06% <ø> (-0.42%)	❌

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[github-actions]

Hi there, thank you for your contribution to Conda!

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