Do not send notifications when instrumentation raise an error.

activesupport/lib/active_support/notifications/instrumenter.rb

@@ -13,9 +13,9 @@ module ActiveSupport
 
       def instrument(name, payload={})
         time = Time.now
-        yield if block_given?
-      ensure
+        result = yield if block_given?
         @notifier.publish(name, time, Time.now, @id, payload)
+        result
       end
 
       private

activesupport/test/notifications_test.rb

@@ -113,20 +113,17 @@ module Notifications
       assert_equal Hash[:payload => "notifications"], @events.last.payload
     end
 
-    def test_instrument_publishes_when_exception_is_raised
+    def test_instrument_does_not_publish_when_exception_is_raised
       begin
         instrument(:awesome, :payload => "notifications") do
           raise "OMG"
         end
-        flunk
-      rescue
+      rescue RuntimeError => e
+        assert_equal "OMG", e.message
       end
 
       drain
-
-      assert_equal 1, @events.size
-      assert_equal :awesome, @events.last.name
-      assert_equal Hash[:payload => "notifications"], @events.last.payload
+      assert_equal 0, @events.size
     end
 
     def test_event_is_pushed_even_without_block