replace count() usage to empty when possible

Author: samsonasik

src/Application.php

@@ -474,7 +474,7 @@ private function checkForDuplicateRoute($path, $methods = null)
             }, false);
         });
 
-        if (count($matches) > 0) {
+        if (! empty($matches)) {
             throw new Exception\DuplicateRouteException(
                 'Duplicate route detected; same name or path, and one or more HTTP methods intersect'
             );