fix: issue where using AzureOpenAI required OPENAI_API_KEY

[willbakst]

Closes #296

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (160df4d) to head (ebdcfb0).

❗ Current head ebdcfb0 differs from pull request most recent head 603f1ae

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Additional details and impacted files

@@            Coverage Diff            @@
##               dev      #297   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          138       138           
  Lines         6985      6986    +1     
=========================================
+ Hits          6985      6986    +1     

Flag	Coverage Δ
tests	100.00% <100.00%> (ø)

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