🐛 Fixed using Offers with Stripe Checkout v2

[allouis]

refs 1f300fb781f0

The Stripe API was giving inconsistent responses when passing the customerEmail param, sometimes it would allow a null/empty value and sometimes it wouldn't. In order to support both behaviours we need to not attach the customerEmail at all unless necessary.

[codecov]

Codecov Report

Base: 53.42% // Head: 53.41% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (b9797bc) compared to base (7fda360).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head b9797bc differs from pull request most recent head db340b9. Consider uploading reports for the commit db340b9 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           v5.22.4   #15749      +/-   ##
===========================================
- Coverage    53.42%   53.41%   -0.02%     
===========================================
  Files         1502     1502              
  Lines        97935    97940       +5     
  Branches     10978    10980       +2     
===========================================
- Hits         52322    52314       -8     
- Misses       44355    44367      +12     
- Partials      1258     1259       +1     

Impacted Files	Coverage Δ
ghost/payments/lib/payments.js	0.00% <0.00%> (ø)
.../data-generator/lib/tables/members-login-events.js	90.69% <0.00%> (-9.31%)	⬇️
ghost/admin/app/components/gh-file-uploader.js	82.94% <0.00%> (-3.11%)	⬇️
ghost/data-generator/lib/tables/posts.js	89.39% <0.00%> (-1.52%)	⬇️
...host/data-generator/lib/tables/members-products.js	100.00% <0.00%> (+2.85%)	⬆️

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