There are some more details in the link I posted but you can see a PDF here: http://bugs.ghostscript.com/attachment.cgi?id=11252
It happened in CS6 and CC 2014. Basically it happens if you only use invisible characters like space for a TTF font, and .notdef does not exist in the font. It looks like InDesign realises no glyph drawing details are needed so the table is zero length. It seems to be causing a printing failure and various issues with other programs so it sounds like this possibility is not well catered for in many programs, though most recover.