[laravel] Fix empty cart validation in ProductController

[sentry]

Fixes REACT-69C. The issue was that: Laravel's checkout function checks $quantities before its definition, causing an Undefined variable exception and a 500 error.

• Moved the empty($quantities) check to occur after $quantities has been populated from $cart['quantities'].
• Ensures that the "Invalid checkout request: cart is empty" exception is correctly thrown when cart['quantities'] is empty.
• Prevents potential incorrect validation or errors if $quantities was checked before being fully processed.

This fix was generated by Seer in Sentry, triggered by yuval.nachon@sentry.io. 👁️ Run ID: 10304769

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[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
empower	Ignored	Preview	Feb 19, 2026 3:46pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 22.07%. Comparing base (680bfca) to head (f0bb8a2).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1289      +/-   ##
==========================================
+ Coverage   22.01%   22.07%   +0.05%     
==========================================
  Files          42       42              
  Lines        1349     1350       +1     
  Branches      174      173       -1     
==========================================
+ Hits          297      298       +1     
  Misses       1026     1026              
  Partials       26       26              

Flag	Coverage Δ
api	5.83% <ø> (ø)
frontend	32.60% <ø> (+0.08%)	⬆️

Components	Coverage Δ
checkout_module	5.83% <ø> (ø)
product_component	26.13% <ø> (ø)
see 1 file with indirect coverage changes