Chats tab menu: no trailing divider when there are no folders

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Chats tab menu: no trailing divider when there are no foldersThe folder list keeps an .allChats entry (the server's dialogFilterDefault)after the last folder is deleted, so the long-press menu read it as non-empty:it said "Edit Folders" and appended a separator with no folders after it.Decide on whether the list holds any folder instead.Co-Authored-By: Claude Opus 5.5