SceneA设置autoReleaseAssets为true;
SceneA添加prefabA，prefabA添加prefabB
然后跳转到SceneB，中间显示：
a.json was released but maybe still referenced by b.json
SceneB添加prefabC，其中包含prefabB里的一张图片，这时候卡死：
callbacks-invoker.js:201 Uncaught TypeError: Cannot read property ‘load’ of null
at cc_SpriteFrame.277.proto.hasEventListener (callbacks-invoker.js:201)
at cc_SpriteFrame.190.proto.on (event-target.js:106)
at cc_SpriteFrame.190.proto.once (event-target.js:202)
at cc_SpriteFrame.onTextureLoaded (CCSpriteFrame.js:250)
at cc_Sprite._applySpriteFrame (CCSprite.js:495)
at cc_Sprite.onEnable (CCSprite.js:420)
at cc_Sprite.onEnable (CCClass.js:761)
at CCClass.invokeOnEnable [as _invoke] (component-scheduler.js:336)
at CCClass.invoke (component-scheduler.js:140)
at CCClass.activateNode (node-activator.js:253)
277.proto.hasEventListener @ callbacks-invoker.js:200
190.proto.on @ event-target.js:103
190.proto.once @ event-target.js:201
onTextureLoaded @ CCSpriteFrame.js:249
_applySpriteFrame @ CCSprite.js:494
onEnable @ CCSprite.js:419
(anonymous) @ CCClass.js:759
invokeOnEnable @ component-scheduler.js:335
invoke @ component-scheduler.js:137
activateNode @ node-activator.js:252
_onHierarchyChanged @ base-node.js:1162
_onHierarchyChanged @ CCNode.js:1699
setParent @ base-node.js:399
addChild @ CCNode.js:3606
showHelp @ assets\scripts\ui\Select.js:32
emit @ CCComponentEventHandler.js:165
emitEvents @ CCComponentEventHandler.js:130
_onTouchEnded @ CCButton.js:700
277.proto.emit @ callbacks-invoker.js:337
_doDispatchEvent @ CCNode.js:644
dispatchEvent @ CCNode.js:2329
_touchEndHandler @ CCNode.js:487
_onTouchEventCallback @ CCEventManager.js:513
_dispatchEventToListeners @ CCEventManager.js:640
_dispatchTouchEvent @ CCEventManager.js:562
dispatchEvent @ CCEventManager.js:1018
handleTouchesEnd @ CCInputManager.js:210
_mouseEventsOnElement @ CCInputManager.js:454
(anonymous) @ CCInputManager.js:480
render-flow.js:74 Uncaught TypeError: Cannot read property ‘_assembler’ of null
at RenderFlow.314._proto._updateRenderData (render-flow.js:74)
at RenderFlow.314._proto._worldTransform (render-flow.js:49)
at RenderFlow.314._proto._localTransform (render-flow.js:32)
at RenderFlow.314._proto._children (render-flow.js:111)
at RenderFlow.314._proto._color (render-flow.js:68)
at RenderFlow.314._proto._opacity (render-flow.js:58)
at RenderFlow.314._proto._worldTransform (render-flow.js:49)
at RenderFlow.314._proto._localTransform (render-flow.js:32)
at RenderFlow.314._proto._children (render-flow.js:111)
不停的死循环输出：
render-flow.js:74 Uncaught TypeError: Cannot read property ‘_assembler’ of null
另外，2.2.2版本没这个问题
