Duplicate NLU folder in `model.tar.gz`

Sometimes, when I train a model, the resulting .tar.gz file contains a copy of its nlu folder inside itself, resulting in a model about twice the size it should be.

model.tar.gz:

model.tar.gz/nlu (contains a copy of itself):

model.tar.gz/nlu/nlu:

Solved in 2.7.2 (#8711)