Converts A && A.B into A?.B (#54342)

Implements the ?. operator, replacing code like A && A.B with A?.B

BYOND Ref:
When reading A?.B, it's equivalent to A && A.B except that A is only evaluated once, even if it's a complex expression like a proc call.

code/modules/shuttle/emergency.dm

@@ -186,7 +186,7 @@
 
 	for(var/obj/item/card/id/ID in src)
 		qdel(ID)
-	if(authorized && authorized.len)
+	if(authorized?.len)
 		authorized.Cut()
 	authorized = null
 

code/modules/shuttle/navigation_computer.dm

@@ -45,7 +45,7 @@
 	. = ..()
 	GLOB.navigation_computers -= src
 
-	if(my_port && my_port.get_docked())
+	if(my_port?.get_docked())
 		my_port.delete_after = TRUE
 		my_port.id = null
 		my_port.name = "Old [my_port.name]"
@@ -154,7 +154,7 @@
 		return
 
 	///Make one use port that deleted after fly off, to don't lose info that need on to properly fly off.
-	if(my_port && my_port.get_docked())
+	if(my_port?.get_docked())
 		my_port.unregister()
 		my_port.delete_after = TRUE
 		my_port.id = null
@@ -279,7 +279,7 @@
 				return SHUTTLE_DOCKER_BLOCKED
 
 /obj/machinery/computer/camera_advanced/shuttle_docker/proc/update_hidden_docking_ports(list/remove_images, list/add_images)
-	if(!see_hidden && current_user && current_user.client)
+	if(!see_hidden && current_user?.client)
 		current_user.client.images -= remove_images
 		current_user.client.images += add_images
 

code/modules/shuttle/shuttle.dm

@@ -188,7 +188,7 @@
 /obj/docking_port/stationary/register()
 	if(!id)
 		id = "dock"
-	else 
+	else
 		port_destinations = id
 
 	if(!name)
@@ -391,7 +391,7 @@
 		name = "shuttle"
 	var/counter = 1
 	var/tmp_id = id
-	var/tmp_name = name	
+	var/tmp_name = name
 	while(Check_id(id))
 		counter++
 		id = "[tmp_id]_[counter]"
@@ -543,7 +543,7 @@
 	var/underlying_area_type = SHUTTLE_DEFAULT_UNDERLYING_AREA
 	// If the shuttle is docked to a stationary port, restore its normal
 	// "empty" area and turf
-	if(current_dock && current_dock.area_type)
+	if(current_dock?.area_type)
 		underlying_area_type = current_dock.area_type
 
 	var/list/old_turfs = return_ordered_turfs(x, y, z, dir)
@@ -691,7 +691,7 @@
 	for(var/place in shuttle_areas)
 		var/area/shuttle/shuttle_area = place
 		shuttle_area.parallax_movedir = FALSE
-	if(assigned_transit && assigned_transit.assigned_area)
+	if(assigned_transit?.assigned_area)
 		assigned_transit.assigned_area.parallax_movedir = FALSE
 	var/list/L0 = return_ordered_turfs(x, y, z, dir)
 	for (var/thing in L0)
@@ -817,7 +817,7 @@
 
 /obj/docking_port/mobile/proc/getDbgStatusText()
 	var/obj/docking_port/stationary/dockedAt = get_docked()
-	. = (dockedAt && dockedAt.name) ? dockedAt.name : "unknown"
+	. = (dockedAt?.name) ? dockedAt.name : "unknown"
 	if(istype(dockedAt, /obj/docking_port/stationary/transit))
 		var/obj/docking_port/stationary/dst
 		if(mode == SHUTTLE_RECALL)