Merged r23666 from trunk to 5.1-stable (#42584).

git-svn-id: https://svn.redmine.org/redmine/branches/5.1-stable@23682 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/email_address.rb

@@ -66,7 +66,7 @@ class EmailAddress < ActiveRecord::Base
 
   # Returns true if domain belongs to domains list.
   def self.domain_in?(domain, domains)
-    domain = domain.downcase
+    domain = domain.to_s.downcase
     domains = domains.to_s.split(/[\s,]+/) unless domains.is_a?(Array)
     domains.reject(&:blank?).map(&:downcase).any? do |s|
       s.start_with?('.') ? domain.end_with?(s) : domain == s
@@ -142,6 +142,10 @@ class EmailAddress < ActiveRecord::Base
 
   def validate_email_domain
     domain = address.partition('@').last
+    # Skip domain validation if the email does not contain a domain part,
+    # to avoid an incomplete error message like "domain not allowed ()"
+    return if domain.empty?
+
     return if self.class.valid_domain?(domain)
 
     if User.current.logged?

test/unit/email_address_test.rb

@@ -63,6 +63,12 @@ class EmailAddressTest < ActiveSupport::TestCase
     end
   end
 
+  def test_domain_in_should_not_raise_exception_when_domain_is_nil
+    assert_nothing_raised do
+      assert_not EmailAddress.domain_in?(nil, 'example.com')
+    end
+  end
+
   def test_should_reject_invalid_email
     assert_not EmailAddress.new(address: 'invalid,email@example.com').valid?
   end