Check if Redis::Namespace is defined in another way to avoid NameError

Author: andrehjr

lib/split/redis_interface.rb

@@ -30,7 +30,7 @@ def add_to_set(set_name, value)
       attr_accessor :redis
 
       def redis_namespace_used?
-        Redis.const_defined?("Namespace") && Split.redis.is_a?(Redis::Namespace)
+        defined?(Redis::Namespace) && Split.redis.is_a?(Redis::Namespace)
       end
   end
 end