fix updated broken checking nondefault parameters

[eaidova]

What does this PR do?

Recent changes in internvl2 models replaces error which models failed on checking non-default parameters with different error type on some models from this family:

  File "C:\hostedtoolcache\windows\Python\3.9.13\x64\lib\site-packages\optimum\exporters\openvino\convert.py", line 694, in export_from_model
    misplaced_generation_parameters = model.config._get_non_default_generation_parameters()
  File "C:\hostedtoolcache\windows\Python\3.9.13\x64\lib\site-packages\transformers\configuration_utils.py", line 1041, in _get_non_default_generation_parameters
    default_config = self.__class__()
  File "C:\Users\runneradmin\.cache\huggingface\modules\transformers_modules\OpenGVLab\InternVL2-1B\e426377ee3f7e84f1110e4c258ea49c00d9ee44d\configuration_internvl_chat.py", line 49, in __init__
    if llm_config.get('architectures')[0] == 'LlamaForCausalLM':
TypeError: 'NoneType' object is not subscriptable

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• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

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