Avoid possible exceptions in CleanUnusedMobilePhones data migration

db/migrate/20150422124519_clean_unused_mobile_phones.rb

@@ -3,7 +3,11 @@ def self.up
     # this will run the before_validation check and clean up
     # users which have a mobile_suffix and mobile_prefix filled even if not needed
     Account.all.each do |user|
-      user.save!
+      if user.valid?
+        user.save
+      else
+        puts "Problems with user: #{user.username}, id: #{user.id},\nerrors: #{user.errors}\n\n"
+      end
     end
   end