[flask] Reorder checkout cart quantity parsing and validation

[sentry]

Fixes MOBILE-REACT-NATIVE-1. The issue was that: quantities variable used before definition in Flask /checkout endpoint, causing NameError and 500 response.

• Moved the initialization of the 'quantities' dictionary to occur before the empty cart check.
• This ensures 'quantities' is always defined when its length is evaluated.

This fix was generated by Seer in Sentry, triggered by prithvirajkumar.rajakumar@sentry.io. 👁️ Run ID: 11175348

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[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
empower	Ignored	Preview	Mar 10, 2026 11:40am

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 22.01%. Comparing base (743e6e1) to head (8e730c0).
⚠️ Report is 3 commits behind head on master.
✅ All tests successful. No failed tests found.

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

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1338   +/-   ##
=======================================
  Coverage   22.01%   22.01%           
=======================================
  Files          42       42           
  Lines        1363     1363           
  Branches      176      176           
=======================================
  Hits          300      300           
  Misses       1036     1036           
  Partials       27       27           

Flag	Coverage Δ
api	5.83% <0.00%> (ø)
frontend	32.33% <ø> (ø)

Components	Coverage Δ
checkout_module	5.83% <0.00%> (ø)
product_component	25.98% <ø> (ø)

Files with missing lines	Coverage Δ
flask/src/main.py	0.00% <0.00%> (ø)