Merge pull request #4477 from Ccomp5950/runtimefixes

Runtimefixes

code/game/objects/items/devices/PDA/PDA.dm

@@ -482,7 +482,8 @@ var/global/list/obj/item/device/pda/PDAs = list()
 		return 0
 	if(!can_use()) //Why reinvent the wheel? There's a proc that does exactly that.
 		U.unset_machine()
-		ui.close()
+		if(ui)
+			ui.close()
 		return 0
 
 	add_fingerprint(U)

code/game/objects/items/weapons/swords_axes_etc.dm

@@ -153,7 +153,7 @@
 	playsound(src.loc, 'sound/weapons/empty.ogg', 50, 1)
 	add_fingerprint(user)
 
-	if(blood_overlay && (blood_DNA.len >= 1)) //updates blood overlay, if any
+	if(blood_overlay && blood_DNA && (blood_DNA.len >= 1)) //updates blood overlay, if any
 		overlays.Cut()//this might delete other item overlays as well but eeeeeeeh
 
 		var/icon/I = new /icon(src.icon, src.icon_state)
@@ -265,4 +265,4 @@
 		H.update_inv_r_hand()
 
 	add_fingerprint(user)
-	return
+	return