It's not normal but I just confirmed the same error with fresh Plone site and buildout.coredev. It seems to be related to the thememapper bundle only (plone and plone-logged-in compile correctly).
The generated Gruntfile.js doesn't include the barcelonetaPath variable as it should per this commit: https://github.com/plone/Products.CMFPlone/commit/8a404a4ab081b7544301523c457405d77c96973a
It was removed in 291477e909660b795f53b6ab1c372c97f0812857. Maybe an accident? I left a comment asking.
On a sidenote I can successfully build that bundle TTW (using @@resourceregistry-controlpanel).