fix: handle missing prices

[firstof9]

fixes #115

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.89%. Comparing base (d63eb5d) to head (fbf4f95).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #116   +/-   ##
=======================================
  Coverage   79.89%   79.89%           
=======================================
  Files           7        7           
  Lines         383      383           
=======================================
  Hits          306      306           
  Misses         77       77           

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