Fix issue where hooks arent delayed properly.

Under certain conditions, get_object_from_string could return that a hook needs to be delayed, but also return nil instead of the string.

vmf/scripts/mods/vmf/modules/core/newhooks.lua

@@ -90,11 +90,12 @@ local function get_object_from_string(obj)
         return obj, true
     elseif type(obj) == "string" then
         local obj_table = rawget(_G, obj)
-        return obj_table, (type(obj_table) == "table")
-    else
-        return obj, false
+        if obj_table then
+            return obj_table, true
         end
     end
+    return obj, false
+end
 
 -- VT1 hooked everything using a "Obj.Method" string
 -- Add backward compatibility for that format.