fix: do not display the move menu when folders are empty

src/lib/components/layout/Sidebar/ChatMenu.svelte

@@ -393,7 +393,7 @@
 				<div class="flex items-center">{$i18n.t('Clone')}</div>
 			</DropdownMenu.Item>
 
-			{#if chatId}
+			{#if chatId && $folders.length > 0}
 				<DropdownMenu.Sub>
 					<DropdownMenu.SubTrigger
 						class="flex gap-2 items-center px-3 py-1.5 text-sm cursor-pointer hover:bg-gray-50 dark:hover:bg-gray-800 rounded-xl select-none w-full"