Fixes some null runtimes (#10916)

* Fixes some nulls

* It's been null always, huh

* and this can be null

code/__DEFINES/bodyparts.dm

@@ -1,4 +1,5 @@
-#define IS_ORGANIC_LIMB(A) (A.bodytype & BODYTYPE_ORGANIC)
+#define IS_ORGANIC_LIMB(A) (A && (A.bodytype & BODYTYPE_ORGANIC))
+#define IS_ROBOTIC_LIMB(A) (A && (A.bodytype & BODYTYPE_ROBOTIC))
 
 #define BODYZONE_STYLE_DEFAULT 0
 #define BODYZONE_STYLE_MEDICAL 1

code/__DEFINES/is_helpers.dm

@@ -207,7 +207,7 @@ GLOBAL_LIST_INIT(turfs_without_ground, typecacheof(list(
 
 #define ismecha(A) (istype(A, /obj/mecha))
 
-#define ismopable(A) (A.layer <= HIGH_SIGIL_LAYER) //If something can be cleaned by floor-cleaning devices such as mops or clean bots
+#define ismopable(A) (A && (A.layer <= HIGH_SIGIL_LAYER)) //If something can be cleaned by floor-cleaning devices such as mops or clean bots
 
 #define isorgan(A) (istype(A, /obj/item/organ))
 

code/game/mecha/equipment/tools/mining_tools.dm

@@ -129,7 +129,7 @@
 		target.apply_damage(10, BRUTE, BODY_ZONE_CHEST, target.run_armor_check(target_part, MELEE))
 
 		//blood splatters and sparks
-		if(issilicon(target)  || isbot(target) || isswarmer(target) || !IS_ORGANIC_LIMB(target_part))
+		if(issilicon(target)  || isbot(target) || isswarmer(target) || IS_ROBOTIC_LIMB(target_part))
 			do_sparks(rand(1, 3), FALSE, target.drop_location())
 		else
 			var/splatter_dir = get_dir(chassis, target)

code/modules/reagents/chemistry/reagents/other_reagents.dm

@@ -1115,16 +1115,18 @@
 	O?.wash(clean_types)
 
 /datum/reagent/space_cleaner/reaction_turf(turf/T, reac_volume)
-	if(reac_volume >= 1)
-		T.wash(clean_types)
-		for(var/am in T)
-			var/atom/movable/movable_content
-			if(ismopable(movable_content)) // Mopables will be cleaned anyways by the turf wash
-				continue
-			movable_content.wash(clean_types)
+	if(reac_volume < 1)
+		return
 
-		for(var/mob/living/simple_animal/slime/M in T)
-			M.adjustToxLoss(rand(5,10))
+	T.wash(clean_types)
+	for(var/am in T)
+		var/atom/movable/movable_content = am
+		if(ismopable(movable_content)) // Mopables will be cleaned anyways by the turf wash
+			continue
+		movable_content.wash(clean_types)
+
+	for(var/mob/living/simple_animal/slime/M in T)
+		M.adjustToxLoss(rand(5,10))
 
 /datum/reagent/space_cleaner/reaction_mob(mob/living/M, method=TOUCH, reac_volume)
 	if(method == TOUCH || method == VAPOR)

code/modules/research/destructive_analyzer.dm

@@ -137,7 +137,7 @@ Note: Must be placed within 3 tiles of the R&D Console
 		var/user_mode_string = ""
 		if(length(point_value))
 			user_mode_string = " for [json_encode(point_value)] points"
-		else if(loaded_item.custom_materials.len)
+		else if(length(loaded_item.custom_materials))
 			user_mode_string = " for material reclamation"
 		var/choice = input("Are you sure you want to destroy [loaded_item][user_mode_string]?") in list("Proceed", "Cancel")
 		if(choice != "Proceed")