Merge pull request #3776 from Citadel-Station-13/upstream-merge-32368

[MIRROR] Cleans up signal redirector

code/datums/components/signal_redirect.dm

@@ -1,9 +1,9 @@
 /datum/component/redirect
 	dupe_mode = COMPONENT_DUPE_ALLOWED
 
-/datum/component/redirect/Initialize(list/signals, _callback)
+/datum/component/redirect/Initialize(list/signals, datum/callback/_callback)
 	//It's not our job to verify the right signals are registered here, just do it.
-	if(!signals || !signals.len || !_callback)
+	if(!LAZYLEN(signals) || !istype(_callback))
 		. = COMPONENT_INCOMPATIBLE
 		CRASH("A redirection component was initialized with incorrect args.")
-	RegisterSignal(signals, _callback)
+	RegisterSignal(signals, _callback)