It inherits the default blanco theme which is there by default, isn't that ok? The blanco theme inherits the base theme in turn, so you would need to revert any changes you made to both of those. I think it's a good idea to inherit the default themes so that you will get any changes made to those by Nokia.

FWIW, when making new themes, in each of the xyz/style/ folders there's only one file xyz.css that's automatically read, the rest need to be imported from that one (@import "zyx.css"). IMO it would be good to make one theme which would only include the transition changes and then another that inherits the first one and includes the other tweaks.