It would be stupid for China to tear apart Israel. It holds Iran and rest of muslim community together. At best China do not stop them tearing apart Israel, but China should not push it into happening. Ideally China should ultilize this and manage both Israel and rest of Islamic world together, the confluct should remain but not boiled to extreme, and not result in immediate victory for either.
"You see that evil nuclear power backed by US slaughtering your kind and occupy a hoky city? Work with me I will help you become richer, stronger, and safer from those bastards."
But when Israel is gone what holds Muslims together? Not good for China.