fixing a bunch of unit test/runtime issues

code/modules/unit_tests/keybinding_init.dm

@@ -3,4 +3,4 @@
 		var/datum/keybinding/KB = i
 		if(initial(KB.keybind_signal) || !initial(KB.name))
 			continue
-		Fail("[KB.name] does not have a keybind signal defined.")
+		Fail("[initial(KB.name)] does not have a keybind signal defined.")

code/modules/unit_tests/merge_type.dm

@@ -10,6 +10,6 @@
 	var/list/paths = subtypesof(/obj/item/stack) - blacklist
 
 	for(var/stackpath in paths)
-		var/obj/item/stack/stack = stackpath
-		if(!initial(stack.merge_type))
+		var/obj/item/stack/stack = new stackpath
+		if(!stack.merge_type)
 			Fail("([stack]) lacks set merge_type variable!")