bug in the AmazonBedrockChatGenerator serialization

[FloRul]

Describe the bug

The serialize_callable function in callable_serialization.py throws an AttributeError when the callable_handle argument is None.

Error message

AttributeError: 'NoneType' object has no attribute 'name'
  File "~\AppData\Local\Programs\Python\Python311\Lib\runpy.py", line 198, in _run_module_as_main
    return _run_code(code, main_globals, None,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "~\AppData\Local\Programs\Python\Python311\Lib\runpy.py", line 88, in _run_code
    exec(code, run_globals)
  File "~\.vscode\extensions\ms-python.debugpy-2024.2.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher/../..\debugpy\__main__.py", line 39, in <module>
    cli.main()
  File "~\.vscode\extensions\ms-python.debugpy-2024.2.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher/../..\debugpy/..\debugpy\server\cli.py", line 430, in main
    run()
  File "~\.vscode\extensions\ms-python.debugpy-2024.2.0-win32-x64\bundled\libs\debugpy\adapter/../..\debugpy\launcher/../..\debugpy/..\debugpy\server\cli.py", line 284, in run_file
    runpy.run_path(target, run_name="__main__")
  File "~\.vscode\extensions\ms-python.debugpy-2024.2.0-win32-x64\bundled\libs\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 321, in run_path
    return _run_module_code(code, init_globals, run_name,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "~\.vscode\extensions\ms-python.debugpy-2024.2.0-win32-x64\bundled\libs\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 135, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "~\.vscode\extensions\ms-python.debugpy-2024.2.0-win32-x64\bundled\libs\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_runpy.py", line 124, in _run_code      
    exec(code, run_globals)
  File "~test.py", line 21, in <module>
    main()
  File "~/test.py", line 14, in main
    yyy = p.dumps()
          ^^^^^^^^^
  File "~\AppData\Local\Programs\Python\Python311\Lib\site-packages\haystack\core\pipeline\pipeline.py", line 196, in dumps
    return marshaller.marshal(self.to_dict())
                              ^^^^^^^^^^^^^^
  File "~\AppData\Local\Programs\Python\Python311\Lib\site-packages\haystack\core\pipeline\pipeline.py", line 118, in to_dict
    components[name] = component_to_dict(instance)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "~\AppData\Local\Programs\Python\Python311\Lib\site-packages\haystack\core\serialization.py", line 24, in component_to_dict
    return obj.to_dict()
           ^^^^^^^^^^^^^
  File "~\AppData\Local\Programs\Python\Python311\Lib\site-packages\haystack_integrations\components\generators\amazon_bedrock\chat\chat_generator.py", line 223, in to_dict
    streaming_callback=serialize_callable(self.streaming_callback),
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "~\AppData\Local\Programs\Python\Python311\Lib\site-packages\haystack\utils\callable_serialization.py", line 20, in serialize_callable
    full_path = callable_handle.__name__
                ^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute '__name__'. Did you mean: '__ne__'?
Expected behavior
The function should handle the case where callable_handle is None and raise a more descriptive error message. For example, it could raise a ValueError with the message "callable_handle must be a callable, not None".

Additional context

This issue occurs when trying to serialize a None value as a callable, which is not a valid operation.

To reproduce the behavior:

from haystack_integrations.components.generators.amazon_bedrock import (
    AmazonBedrockChatGenerator,
)
from haystack import Pipeline


def main():
    p = Pipeline()
    p.add_component(
        "generator",
        # can be any chat supported model
        AmazonBedrockChatGenerator(model="anthropic.claude-3-sonnet-20240229-v1:0"),
    )
    print(p.dumps())

if __name__ == "__main__":
    main()

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Yes

System:
OS: Windows
GPU/CPU: I7
Haystack version (commit or version number): Version: 2.0.1

[anakin87]

duplicate of deepset-ai/haystack-core-integrations#684
fixed in deepset-ai/haystack-core-integrations#685