Fix modular car conditional object NRE that could occur when adding a new module to a chassis, if the following out-of-order scenario occurred: - Server creates the module entity and saves it to client with socket index -1 (no socket) - Server adds the module to the car with socket index now set - Server saves new socket index to client - Client creates the module entity and calculates socket index correctly - Client loads new entity, socket index incorrectly reverts to -1 - Client refreshes module conditionals, bad socket index causes NRE