Missing some keys when using GymEnv

[BDonnot]

Environment

• Grid2op version: 1.6.5
• System: all
• Additional system information

Bug description

When setting the action class to be CompleteAction we cannot use the GymEnv because of some missing keys.

How to reproduce

Just run this in a python repl:

import grid2op
from grid2op.Action import CompleteAction
from grid2op.gym_compat import GymEnv

if __name__ == "__main__":
    env = grid2op.make("educ_case14_storage",
                        test=True,
                        action_class=CompleteAction)

    env_gym = GymEnv(env)

Current output

Traceback (most recent call last):
  File "test_box_act copy.py", line 15, in <module>
    env_gym = GymEnv(env)
  File "grid2op/gym_compat/gymenv.py", line 45, in __init__
    self.action_space = GymActionSpace(self.init_env)
  File "/grid2op/gym_compat/gym_act_space.py", line 138, in __init__
    dict_ = self._fix_dict_keys(dict_)
  File "/grid2op/gym_compat/gym_act_space.py", line 273, in _fix_dict_keys
    res[self.keys_grid2op_2_human[k]] = v
KeyError: 'shunt_p'

Expected output

No error expected