[openstreetmap/openstreetmap-website] Add a preferred_email_format preference (#1511)

[Hervé Saint-Amand]

@saintamh pushed 2 commits.

6e3b1f3  Fix Rubocop errors
76db385  Bugfix: don't yield when no block given


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1511/files/a86e2c93f1245dcbbe8fb117ef70b7cdd5ff753b..76db385d4c93f2364f2b89f5b9189d11907cfc9c
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