refactor :custom_configs

Author: ashmaroli

lib/jekyll/commands/serve.rb

@@ -13,8 +13,7 @@ def process(opts)
         end
 
         def custom_configs
-          return nil unless @overrides
-          @overrides
+          @custom_configs ||= @overrides
         end
 
         def start_up_webrick(opts, destination)