Don't forget to call_next on NullLogHandler

shard.yml

@@ -1,5 +1,5 @@
 name: kemal
-version: 0.15.0
+version: 0.15.1
 
 dependencies:
   radix:

src/kemal/null_log_handler.cr

@@ -2,6 +2,7 @@ module Kemal
   # This is here to represent the logger corresponding to Null Object Pattern.
   class NullLogHandler < Kemal::BaseLogHandler
     def call(context)
+      call_next(context)
     end
 
     def write(message)