[no gbp] Fixes runtimes in shuttle event and shuttle cling (#77343)

Fixes no-candidate runtime from pick() on an empty list
Fixes spawning null movables if run out of mobs to spawn
Fixes shuttle cling qdeling on Initialize due to lattices not counting
as hyperspace

🆑
runtime: Fixes runtimes in shuttle event and shuttle cling code
/🆑

---------

Co-authored-by: Jacquerel <hnevard@gmail.com>

code/modules/shuttle/shuttle_events/_shuttle_events.dm

@@ -106,10 +106,12 @@
 	. = ..()
 
 	if(!.)
-		return FALSE
+		return
 
-	if(!LAZYLEN(spawning_list) && self_destruct_when_empty)
-		return SHUTTLE_EVENT_CLEAR
+	if(!LAZYLEN(spawning_list))
+		if(self_destruct_when_empty)
+			return SHUTTLE_EVENT_CLEAR
+		return
 
 	if(prob(spawn_probability_per_process))
 		for(var/i in 1 to spawns_per_spawn)

code/modules/shuttle/shuttle_events/carp.dm

@@ -9,6 +9,7 @@
 	spawn_probability_per_process = 20
 
 	remove_from_list_when_spawned = TRUE
+	self_destruct_when_empty = TRUE
 
 /datum/shuttle_event/simple_spawner/carp/post_spawn(mob/living/basic/carp/carpee)
 	. = ..()
@@ -26,6 +27,7 @@
 	spawn_probability_per_process = 20
 
 	remove_from_list_when_spawned = TRUE
+	self_destruct_when_empty = TRUE
 
 ///Spawn a bunch of friendly carp to view from inside the shuttle! May occassionally pass through and nibble some windows, but are otherwise pretty harmless
 /datum/shuttle_event/simple_spawner/carp/friendly

code/modules/shuttle/shuttle_events/misc.dm

@@ -20,6 +20,7 @@
 	spawn_probability_per_process = 5
 
 	remove_from_list_when_spawned = TRUE
+	self_destruct_when_empty = TRUE
 
 ///Just spawn random maint garbage
 /datum/shuttle_event/simple_spawner/maintenance

code/modules/shuttle/shuttle_events/player_controlled.dm

@@ -15,13 +15,18 @@
 	else
 		..()
 
+/// Attempt to grant control of a mob to ghosts before spawning it in. if spawn_anyway_if_no_player = TRUE, we spawn the mob even if there's no ghosts
 /datum/shuttle_event/simple_spawner/player_controlled/proc/try_grant_ghost_control(spawn_type)
 	var/list/candidates = poll_ghost_candidates(ghost_alert_string + " (Warning: you will not be able to return to your body!)", role_type, FALSE, 10 SECONDS)
-	var/mob/dead/observer/candidate = pick(candidates)
-	if(candidate || spawn_anyway_if_no_player)
-		var/mob/living/new_mob = new spawn_type (get_turf(get_spawn_turf()))
-		if(candidate)
-			new_mob.ckey = candidate.ckey
+
+	if(!candidates.len && !spawn_anyway_if_no_player)
+		return
+
+	var/mob/living/new_mob = new spawn_type (get_turf(get_spawn_turf()))
+
+	if(candidates.len)
+		var/mob/dead/observer/candidate = pick(candidates)
+		new_mob.ckey = candidate.ckey
 		post_spawn(new_mob)
 
 ///BACK FOR REVENGE!!!
@@ -37,6 +42,7 @@
 	spawn_anyway_if_no_player = FALSE
 	ghost_alert_string = "Would you like to be an alien queen shot at the shuttle?"
 	remove_from_list_when_spawned = TRUE
+	self_destruct_when_empty = TRUE
 
 	role_type = ROLE_ALIEN
 
@@ -53,6 +59,7 @@
 	spawn_anyway_if_no_player = TRUE
 	ghost_alert_string = "Would you like to be a space carp to pester the emergency shuttle?"
 	remove_from_list_when_spawned = TRUE
+	self_destruct_when_empty = TRUE
 
 	role_type = ROLE_SENTIENCE