Anon users should not be able to see it

Instead of checking that user exist, checking that user id > 0

templates/upload.html

@@ -29,7 +29,7 @@
 			<input type="checkbox" name="remake" id="remake" >
 			<label for="remake">{{call $.T "mark_as_remake"}}</label>
 		</p>
-		{{ if $.User }}
+		{{ if gt $.User.ID 0 }}
 		<p>
 			<input type="checkbox" name="hidden" id="hidden" >
 			<label for="hidden">{{call $.T "mark_as_hidden"}}</label>