For Illustrator, I use a plugin called Select Menu: https://rj-graffix.com/select-menu-cs6-cc-2017-available/
I don’t recall what the default select options are in Illustrator, so I’m including that info just in case you can’t do this with the default select options.
For this, I just made some text and turned it to outlines as we normally would. Below that, I also made a click with the text tool and deleted out the lorum ipsum (in the CC version of Illustrator, it leaves the lorum ipsum text if you escape out, or whatever. In older versions, it would just automatically leave the blank text box).
To find these text objects, I would go to Select > Object > All Text Objects (as mentioned, I’m not sure if that is a default select option, or if it’s from my Plugin)
After I click that, you can see the little blue dot that is the selected text box.
That gives a visual indication that you have an empty text path. A good practice though with any of the files in Illustrator, before you send out to SVG and to the Glowforge, is to go to Menu option Object > Path > Cleanup. That will delete stray points, empty text boxes, etc.