Check select shipping state should be applied

[markjan]

When creating an order using this plugin for a ProductVariant with shippingRequired = false I get an exception SMException in \Sylius\AdminOrderCreationPlugin\EventListener\OrderCreationListener::completeOrderBeforeCreation because the 'select_shipping' state can not be applied.

I suggest checking that state can be applied first as is done for the payment in the lines below:

if($stateMachine->can(OrderCheckoutTransitions::TRANSITION_SELECT_SHIPPING)) {
   $stateMachine->apply(OrderCheckoutTransitions::TRANSITION_SELECT_SHIPPING);
}

I can send you a path for the class and spec if you want.