[Graph]: fix a bug in init of customized_vertex_queue.
[Graph]: fix a bug in init of customized_vertex_queue.

icoming/FlashX,zheng-da/FlashX,zheng-da/FlashX,zheng-da/FlashX,icoming/FlashX,icoming/FlashX,silky/FlashGraph,icoming/FlashGraph,silky/FlashGraph,silky/FlashGraph,icoming/FlashX,silky/FlashGraph,flashxio/FlashX,flashxio/FlashX,flashxio/FlashX,icoming/FlashGraph,flashxio/FlashX,icoming/FlashX,icoming/FlashGraph,zheng-da/FlashX,flashxio/FlashX,icoming/FlashGraph,zheng-da/FlashX,flashxio/FlashX,icoming/FlashGraph,silky/FlashGraph