Minor runtimes fixes. (#25566)

* Fixes power monitor runtime

* Fixes reagent data runtime

* Nullspace is no smoking zone

code/game/objects/effects/effect_system/effects_smoke.dm

@@ -73,6 +73,8 @@
 
 /obj/effect/particle_effect/smoke/proc/spread_smoke()
 	var/turf/t_loc = get_turf(src)
+	if(!t_loc)
+		return 
 	var/list/newsmokes = list()
 	for(var/turf/T in t_loc.GetAtmosAdjacentTurfs())
 		var/obj/effect/particle_effect/smoke/foundsmoke = locate() in T //Don't spread smoke where there's already smoke!

code/modules/hydroponics/seeds.dm

@@ -163,7 +163,7 @@
 				T.reagents.add_reagent(reagent_id, 1 + round(potency * reagents_add[reagent_id], 1), list("blood_type"="O-"))
 				continue
 
-			T.reagents.add_reagent(reagent_id, 1 + round(potency * reagents_add[reagent_id]), 1)
+			T.reagents.add_reagent(reagent_id, 1 + round(potency * reagents_add[reagent_id],1))
 		return 1
 
 

code/modules/modular_computers/file_system/programs/powermonitor.dm

@@ -81,7 +81,7 @@
 			if(istype(A))
 				data["areas"] += list(list(
 					"name" = A.area.name,
-					"charge" = A.cell.percent(),
+					"charge" = A.cell ? A.cell.percent() : 0,
 					"load" = A.lastused_total,
 					"charging" = A.charging,
 					"eqp" = A.equipment,