Fix crash in azure-ad-b2c provider (v4) #13217
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☕️ Reasoning
Not all b2c-setups return a list of emails for a profile. This fixes the resulting crash by using defensive access when reading/setting the profile email address field.
This is a copy of a merged PR from 2 years ago that is in the main branch but never made it to the v4 branch.
#8616
🧢 Checklist
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Ready to be merged
🎫 Affected issues
None found.
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