added nullcheck to ZAS func, fix for severed powernets still being connected

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>

code/ZAS/FEA_system.dm

@@ -277,6 +277,10 @@ datum
 
 			proc/ConsiderRebuild(var/turf/simulated/T, var/turf/NT)
 
+				//zones should naturally spread to these tiles eventually
+				if(!T.zone || !NT.zone)
+					return
+
 				if(istype(NT, /turf/simulated) && NT.zone != T.zone)
 					T.zone.RemoveTurf(NT)
 					if(NT.zone)

code/modules/power/power.dm

@@ -119,6 +119,8 @@
 			if(!unmarked || !C.powernet)
 				if(C.d1 == fdir || C.d2 == fdir)
 					. += C
+				else if(C.d1 == turn(C.d2, 180))
+					. += C
 	return .