fix(checkout): improve logic for cart validation and Sentry status reporting

[sentry]

Fixes FRONTEND-REACT-6BK. The issue was that: Flask backend's checkout function attempts to access quantities before definition, causing a NameError and a 500 response.

• In Flask, moved the quantities dictionary comprehension to ensure it's defined before checking its length, preventing potential errors with empty carts.
• In React, corrected the conditional logic for setting Sentry checkout_submit.status attributes, ensuring they are only set when response.error is false and response.status is defined.

This fix was generated by Seer in Sentry, triggered by prithvirajkumar.rajakumar@sentry.io. 👁️ Run ID: 11917791

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
empower	Ignored	Preview	Mar 17, 2026 8:08pm

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 22.01%. Comparing base (76a3296) to head (372defa).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
flask/src/main.py	0.00%	1 Missing ⚠️
react/src/components/CheckoutForm.jsx	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (50.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (22.01%) is below the target coverage (35.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1356   +/-   ##
=======================================
  Coverage   22.01%   22.01%           
=======================================
  Files          42       42           
  Lines        1363     1363           
  Branches      176      176           
=======================================
  Hits          300      300           
- Misses       1036     1037    +1     
+ Partials       27       26    -1     

Flag	Coverage Δ
api	5.82% <0.00%> (ø)
frontend	32.37% <0.00%> (ø)

Components	Coverage Δ
checkout_module	5.82% <0.00%> (ø)
product_component	26.03% <0.00%> (ø)

Files with missing lines	Coverage Δ
flask/src/main.py	0.00% <0.00%> (ø)
react/src/components/CheckoutForm.jsx	15.92% <0.00%> (ø)

... and 1 file with indirect coverage changes