Auth-related error sometimes occur when performing a search

[amarandon]

While performing a search on the dedl provider, I sometimes get this error. Unfortunately this isn't always reproducible.

2024-10-17 17:35:14,362 eodag.core                       [INFO    ] Searching on provider dedl
2024-10-17 17:35:14,363 eodag.auth.token_exchange        [DEBUG   ] Getting subject auth token
2024-10-17 17:35:14,363 eodag.auth.openid_connect        [DEBUG   ] Fetching access token from https://auth.destine.eu/realms/desp/protocol/openid-connect/token
2024-10-17 17:35:14,470 eodag.core                       [ERROR   ] Error while searching on provider dedl (ignored):
Traceback (most recent call last):
  File "/home/amarando/Projects/eodag/eodag/api/core.py", line 1872, in _do_search
    if auth := self._plugins_manager.get_auth(
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        search_plugin.provider,
        ^^^^^^^^^^^^^^^^^^^^^^^
        getattr(search_plugin.config, "api_endpoint", None),
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        search_plugin.config,
        ^^^^^^^^^^^^^^^^^^^^^
    ):
    ^
  File "/home/amarando/Projects/eodag/eodag/plugins/manager.py", line 393, in get_auth
    auth = auth_plugin.authenticate()
  File "/home/amarando/Projects/eodag/eodag/plugins/authentication/token_exchange.py", line 93, in authenticate
    subject_auth = self.subject.authenticate()
  File "/home/amarando/Projects/eodag/eodag/plugins/authentication/openid_connect.py", line 286, in authenticate
    self.token_info["access_token"] = self._get_access_token()
                                      ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/amarando/Projects/eodag/eodag/plugins/authentication/openid_connect.py", line 86, in _get_access_token
    res = self._request_new_token()
  File "/home/amarando/Projects/eodag/eodag/plugins/authentication/openid_connect.py", line 298, in _request_new_token
    authentication_response = self.authenticate_user(state)
  File "/home/amarando/Projects/eodag/eodag/plugins/authentication/openid_connect.py", line 375, in authenticate_user
    login_form = login_forms[0]
                 ~~~~~~~~~~~^^^
IndexError: list index out of range