With the recent rework in master if you change bblayers.conf to have a bad line continuation (e.g. a comment that ends in \ with a blank line after it) then you get back a rather ugly error message with lines that should be separated out crunched together.
I can't reproduce this. Maybe fixed?
Not fixed but I've sent out a patch for it
https://git.yoctoproject.org/poky/commit/bitbake?id=bc6d96e69684253a7236594cb0af2738be06b7a9