Runtime fixes (#2017)

changes:

Added more QDELETED checks to organ processing.
Fixed some misc runtimes in lighting & sparks.

code/modules/mob/living/carbon/human/human_organs.dm

@@ -25,6 +25,11 @@
 
 	//processing internal organs is pretty cheap, do that first.
 	for(var/obj/item/organ/I in internal_organs)
+		if (QDELETED(I))
+			log_debug("Organ [DEBUG_REF(src)] was not properly removed from its parent!")
+			internal_organs -= I
+			continue
+			
 		I.process()
 
 	handle_stance()