For desktop, the Note Overview plugin can help find notes with empty bodies.

Install the plugin. Create a new note with the following content:

<!-- note-overview-plugin
search: -body:*
fields: size, title
-->

Open the Tools menu, then click Create note overview. This tabulates all notes below the above content. Empty notes with empty titles show up first.

Press Ctrl + A to select all lines in the note.

Open the Edit menu, then click Sort selected lines (or use the keyboard shortcut). This sorts selected lines so empty notes with a 0 byte size show first in the table.