修复 fetchUser: false 时 req.sessionToken 为空的问题

Author: jysperm

lib/leanengine.js

@@ -356,7 +356,7 @@ var prepareRequestObject = function(options) {
     /* User from client */
     currentUser: currentUser,
 
-    sessionToken: currentUser && currentUser.getSessionToken()
+    sessionToken: (currentUser && currentUser.getSessionToken()) || req.sessionToken
   };
 };