bugfix: few runtime fixes (ss220-space#4052)

code/datums/browser.dm

@@ -101,14 +101,16 @@
 	[get_footer()]
 	"}
 
-/datum/browser/proc/open(var/use_onclose = 1, var/no_focus = 0)
+/datum/browser/proc/open(use_onclose = TRUE, no_focus = FALSE)
 	set waitfor = FALSE
 	var/window_size = ""
 	if(width && height)
 		window_size = "size=[width]x[height];"
 	user << browse(get_content(), "window=[window_id];[window_size][window_options]")
 	for(var/i in 1 to 1000)
-		if(winexists(user,window_id))
+		if(!user || !user.client)
+			return
+		if(winexists(user, window_id))
 			break
 		sleep(1)
 	if(no_focus)

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

@@ -151,7 +151,7 @@
 	var/ue_to_compare = (old_ue) ? old_ue : dna.unique_enzymes
 	var/list/all_bits = internal_organs|bodyparts
 	for(var/obj/item/organ/organ as anything in all_bits)
-		if(assimilate || organ.dna.unique_enzymes == ue_to_compare)
+		if(assimilate || organ.dna?.unique_enzymes == ue_to_compare)
 			organ.update_DNA(dna)
 
 

code/modules/surgery/organs_internal.dm

@@ -243,21 +243,20 @@
 				user.visible_message("[user] notices that no dead organs in [target]'s [affected.name].", \
 					"You notice that no dead organs in [target]'s [affected.name].")
 			return FALSE
-		else if(C.reagents.has_reagent("mitocholide"))
+		if(C.reagents.has_reagent("mitocholide"))
 			user.visible_message("[user] notices there is not enough mitocholide in [tool].", \
 				"You notice there is not enough mitocholide in [tool].")
 			return FALSE
+		if(C.reagents.total_volume <= 0) //end_step handles if there is not enough reagent
+			user.visible_message("[user] notices [tool] is empty.", "You notice [tool] is empty.")
+			return FALSE
 
 		for(var/obj/item/organ/internal/organ as anything in affected.internal_organs)
-			if(C.reagents.total_volume <= 0) //end_step handles if there is not enough reagent
-				user.visible_message("[user] notices [tool] is empty.", "You notice [tool] is empty.")
-				return FALSE
-
-			var/msg = "[user] starts pouring some of [tool] over [target]'s [I.name]."
-			var/self_msg = "You start pouring some of [tool] over [target]'s [I.name]."
+			var/msg = "[user] starts pouring some of [tool] over [target]'s [organ.name]."
+			var/self_msg = "You start pouring some of [tool] over [target]'s [organ.name]."
 			if(istype(C,/obj/item/reagent_containers/syringe))
-				msg = "[user] begins injecting [tool] into [target]'s [I.name]."
-				self_msg = "You begin injecting [tool] into [target]'s [I.name]."
+				msg = "[user] begins injecting [tool] into [target]'s [organ.name]."
+				self_msg = "You begin injecting [tool] into [target]'s [organ.name]."
 			user.visible_message(msg, self_msg)
 			if(H && affected)
 				H.custom_pain("Something burns horribly in your [affected.name]!")