[HANDS-ON BUG] Unit-1: make sure model_name is not empty

[znacer]

Describe the bug

This bug is found in the following notebook : Unit-1
In section Train the PPO agent 🏃 , an empty string is assigned by default to variable model_name.
If one let this value to empty, an error will be raised in section Load a saved LunarLander model from the Hub 🤗. When user try to upload his model with an empty model_name.
Error raised: FileNotFoundError: [Errno 2] No such file or directory

Material

Google Colab

Suggestions

Change

# TODO: Specify file name for model and save the model to file
model_name = ""

by

# TODO: Specify file name for model and save the model to file
model_name = "ppo-LunarLander-v2"

or

# TODO: Specify a non empty file name for model and save the model to file
model_name = 

[simoninithomas]

Hey, thanks for pointing this out 🤗. I'm adding it to this month update

[simoninithomas]

Updated thanks again 🤗