Ruby 2.7: FrozenError when new LDAP users try to login (#35135).

Patch by Pavel Rosický.


git-svn-id: http://svn.redmine.org/redmine/trunk@20966 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/auth_source_ldap.rb

@@ -247,7 +247,7 @@ class AuthSourceLdap < AuthSource
     def get_attr(entry, attr_name)
       if !attr_name.blank?
         value = entry[attr_name].is_a?(Array) ? entry[attr_name].first : entry[attr_name]
-        value.to_s.force_encoding('UTF-8')
+        (+value.to_s).force_encoding('UTF-8')
       end
     end
   end