Validate that service handlers can not have a formatter set, fixes #50

Author: Seldaek

DependencyInjection/Configuration.php

@@ -392,6 +392,10 @@ public function getConfigTreeBuilder()
                             ->end()
                             ->scalarNode('formatter')->end()
                         ->end()
+                        ->validate()
+                            ->ifTrue(function($v) { return 'service' === $v['type'] && !empty($v['formatter']); })
+                            ->thenInvalid('Service handlers can not have a formatter configured in the bundle, you must reconfigure the service itself instead')
+                        ->end()
                         ->validate()
                             ->ifTrue(function($v) { return ('fingers_crossed' === $v['type'] || 'buffer' === $v['type']) && 1 !== count($v['handler']); })
                             ->thenInvalid('The handler has to be specified to use a FingersCrossedHandler or BufferHandler')