[Routing] Fix BC break in AnnotationClassLoader defaults attributes handling

Author: chalasr

Loader/AnnotationClassLoader.php

@@ -138,6 +138,11 @@ protected function addRoute(RouteCollection $collection, $annot, $globals, \Refl
         }
 
         $defaults = array_replace($globals['defaults'], $annot->getDefaults());
+        foreach ($method->getParameters() as $param) {
+            if (false !== strpos($globals['path'].$annot->getPath(), sprintf('{%s}', $param->getName())) && !isset($defaults[$param->getName()]) && $param->isDefaultValueAvailable()) {
+                $defaults[$param->getName()] = $param->getDefaultValue();
+            }
+        }
         $requirements = array_replace($globals['requirements'], $annot->getRequirements());
         $options = array_replace($globals['options'], $annot->getOptions());
         $schemes = array_merge($globals['schemes'], $annot->getSchemes());