Subscriber should not explode if a non namespaced instrumentation is given.

railties/lib/rails/log_subscriber.rb

@@ -60,8 +60,9 @@ module Rails
 
     def self.dispatch(args)
       namespace, name = args[0].split(".")
-      log_subscriber = log_subscribers[namespace.to_sym]
+      return unless namespace && name
 
+      log_subscriber = log_subscribers[namespace.to_sym]
       if log_subscriber.respond_to?(name) && log_subscriber.logger
         begin
           log_subscriber.send(name, ActiveSupport::Notifications::Event.new(*args))

railties/test/log_subscriber_test.rb

@@ -79,7 +79,7 @@ class SyncLogSubscriberTest < ActiveSupport::TestCase
     Rails::LogSubscriber.add :my_log_subscriber, @log_subscriber
     instrument "my_log_subscriber.unknown_event"
     wait
-    # If we get here, it means that NoMethodError was raised.
+    # If we get here, it means that NoMethodError was not raised.
   end
 
   def test_does_not_send_the_event_if_logger_is_nil
@@ -90,6 +90,12 @@ class SyncLogSubscriberTest < ActiveSupport::TestCase
     wait
   end
 
+  def test_does_not_fail_with_non_namespaced_events
+    Rails::LogSubscriber.add :my_log_subscriber, @log_subscriber
+    instrument "whatever"
+    wait
+  end
+
   def test_flushes_loggers
     Rails::LogSubscriber.add :my_log_subscriber, @log_subscriber
     Rails::LogSubscriber.flush_all!