Converts Most Destroys to use QDEL_NULL

code/modules/hydroponics/biogenerator.dm

@@ -31,12 +31,8 @@
 	RefreshParts()
 
 /obj/machinery/biogenerator/Destroy()
-	if(beaker)
-		qdel(beaker)
-		beaker = null
-	if(files)
-		qdel(files)
-		files = null
+	QDEL_NULL(beaker)
+	QDEL_NULL(files)
 	return ..()
 
 /obj/machinery/biogenerator/ex_act(severity)

code/modules/hydroponics/gene_modder.dm

@@ -36,12 +36,8 @@
 	reagent_genes.Cut()
 	trait_genes.Cut()
 	target = null
-	if(seed)
-		qdel(seed)
-		seed = null
-	if(disk)
-		qdel(disk)
-		disk = null
+	QDEL_NULL(seed)
+	QDEL_NULL(disk)
 	return ..()
 
 /obj/machinery/plantgenes/RefreshParts()
@@ -384,9 +380,7 @@
 	pixel_y = rand(-5, 5)
 
 /obj/item/weapon/disk/plantgene/Destroy()
-	if(gene)
-		qdel(gene)
-		gene = null
+	QDEL_NULL(gene)
 	return ..()
 
 /obj/item/weapon/disk/plantgene/attackby(obj/item/weapon/W, mob/user, params)

code/modules/hydroponics/grown.dm

@@ -40,9 +40,7 @@
 		add_juice()
 
 /obj/item/weapon/reagent_containers/food/snacks/grown/Destroy()
-	if(seed)
-		qdel(seed)
-		seed = null
+	QDEL_NULL(seed)
 	return ..()
 
 /obj/item/weapon/reagent_containers/food/snacks/grown/proc/add_juice()

code/modules/hydroponics/growninedible.dm

@@ -32,9 +32,7 @@
 		add_juice()
 
 /obj/item/weapon/grown/Destroy()
-	if(seed)
-		qdel(seed)
-		seed = null
+	QDEL_NULL(seed)
 	return ..()
 
 /obj/item/weapon/grown/attackby(obj/item/O, mob/user, params)

code/modules/hydroponics/hydroponics.dm

@@ -75,9 +75,7 @@
 	plant_hud_set_water()
 
 /obj/machinery/hydroponics/Destroy()
-	if(myseed)
-		qdel(myseed)
-		myseed = null
+	QDEL_NULL(myseed)
 	return ..()
 
 /obj/machinery/hydroponics/constructable/attackby(obj/item/I, mob/user, params)