Fixes nullspace breathing runtime. (#27777)

* Fixes nullspace breathing runtime.

* Stack trace for nullspaced carbons.

code/modules/mob/living/carbon/carbon_life.dm

@@ -55,7 +55,11 @@
 
 /datum/milla_safe/carbon_breathe/on_run(mob/living/carbon/carbon)
 	var/turf/T = get_turf(carbon)
-	carbon.breathe(get_turf_air(T))
+	if(istype(T))
+		carbon.breathe(get_turf_air(T))
+	else
+		var/datum/gas_mixture/vacuum = new()
+		carbon.breathe(vacuum)
 
 //Second link in a breath chain, calls check_breath()
 /mob/living/carbon/proc/breathe(datum/gas_mixture/environment)

code/modules/mob/living/carbon/carbon_procs.dm

@@ -1,6 +1,8 @@
 /mob/living/carbon/Initialize(mapload)
 	. = ..()
 	GLOB.carbon_list += src
+	if(!loc)
+		stack_trace("Carbon mob being instantiated in nullspace")
 
 /mob/living/carbon/Destroy()
 	// This clause is here due to items falling off from limb deletion