secure Identity#email in case of missing auth_data_dump hash (#11936) (#12322)

* secure Identity#email in case of missing auth_data_dump hash (#11936)

* Refactor Identity#email

* Delete wrongly commited debugging line

* extract no email found message into Const

* refactor Identity#email to use || as flow control

app/models/identity.rb

@@ -1,4 +1,7 @@
 class Identity < ApplicationRecord
+  NO_EMAIL_MSG = "No email found. Please relink your %<provider>s " \
+                 "account to avoid errors.".freeze
+
   belongs_to :user
 
   scope :enabled, -> { where(provider: Authentication::Providers.enabled) }
@@ -39,6 +42,6 @@ class Identity < ApplicationRecord
   end
 
   def email
-    auth_data_dump.info.email
+    auth_data_dump&.info&.email || format(NO_EMAIL_MSG, provider: provider)
   end
 end