gcDestroyed fixes

code/ATMOSPHERICS/atmospherics.dm

@@ -161,7 +161,7 @@ Pipelines + Other Objects -> Pipe network
 			user << "<span class='warning'>As you begin unwrenching \the [src] a gush of air blows in your face... maybe you should reconsider?</span>"
 			unsafe_wrenching = TRUE //Oh dear oh dear
 		
-		if (do_after(user, 40, target = src) && !gcDestroyed)
+		if (do_after(user, 40, target = src) && isnull(gcDestroyed))
 			user.visible_message( \
 				"[user] unfastens \the [src].", \
 				"<span class='notice'>You have unfastened \the [src].</span>", \
@@ -306,4 +306,5 @@ Pipelines + Other Objects -> Pipe network
 	
 /obj/machinery/atmospherics/singularity_pull(S, current_size)
 	if(current_size >= STAGE_FIVE)
-		Deconstruct()	
+		Deconstruct()	
+		

code/ATMOSPHERICS/pipes/pipe.dm

@@ -27,7 +27,7 @@
 			qdel(meter)
 	. = ..()
 
-	if(parent && !parent.gcDestroyed)
+	if(parent && isnull(parent.gcDestroyed))
 		qdel(parent)
 	parent = null