Fix: Bad request error when no email provider is configured

[ankita10119]

🔧 Changes

Added a guard in emailProvider.ts to short-circuit the delete/update logic when no existing provider is present (!existing.name). If there's nothing to delete, we return early and skip the API call entirely.

🔬 Testing

Added a test case covering the scenario where emailProvider is empty, AUTH0_ALLOW_DELETE is true, and no existing provider exists - asserting that neither update nor create are called.

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.16%. Comparing base (7e07417) to head (ae82f87).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1321   +/-   ##
=======================================
  Coverage   80.15%   80.16%           
=======================================
  Files         152      152           
  Lines        6088     6089    +1     
  Branches     1243     1244    +1     
=======================================
+ Hits         4880     4881    +1     
  Misses        693      693           
  Partials      515      515           

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