Check if `eval_loader` is empty => skip evaluation

Merge branch 'coqui-ai:main' into main

Removing because this assignment is redundant => `epochs_done` are as…

…signed in `_fit()`

Bump up to v0.0.12

Bump up to v0.0.11

Bump up to v0.0.10

Implement ```setup_training_environment``` (coqui-ai#36)

* Implement ```setup_training_environment```

* Make style

Bump up to v0.0.8

Bump up to v0.0.7

Bump up to v0.0.6