[workflow] determines places form transitions

Author: lyrixx

DependencyInjection/Configuration.php

@@ -486,8 +486,6 @@ private function addWorkflowSection(ArrayNodeDefinition $rootNode): void
                                                 return array_values($places);
                                             })
                                         ->end()
-                                        ->isRequired()
-                                        ->requiresAtLeastOneElement()
                                         ->prototype('array')
                                             ->children()
                                                 ->scalarNode('name')