KeyError: ‘render_modes’ with Gym == 0.25.0

[ntoxeg]

Describe the bug Trying to create an environment with gym.make results in an exception

File "/Users/ntoxeg/Library/Caches/pypoetry/virtualenvs/narca-622vlgQS-py3.10/lib/python3.10/site-packages/gym/envs/registration.py", line 625, in make
    render_modes = env_creator.metadata["render_modes"]
KeyError: ‘render_modes'

To Reproduce Steps to reproduce the behavior: Install latest Gym (0.25.0 in my case). Invoke something like

env = gym.make(
        "GDY-Drunk-Dwarf-v0",
        player_observer_type=gd.ObserverType.VECTOR,
        level=0,
   )

Expected behavior Getting an instance of an environment.

Desktop (please complete the following information):

• OS: macOS
• Version 12.5

[ntoxeg]

I don’t know why Poetry installed the newest version even though I can see it pinned in the requirements.txt but I guess this report can be useful for squashing the rest of the bugs with newer Gym.

[Bam4d]

relates to #196

[Bam4d]

will be fixed in #282