Tools without parameters cause AttributeError in LiteLLM integration

[ar0it]

Tools without parameters cause an AttributeError in the LiteLLM integration's _function_declaration_to_tool_param() function because it tries to access function_declaration.parameters.required when parameters is None.

The fix is to add a null check: if function_declaration.parameters and function_declaration.parameters.required:

[ar0it]

Same bug as issue #2763

[ankursharmas]

@GWeale I think the check needs to happen here:

adk-python/src/google/adk/models/lite_llm.py

Line 395 in a503a0c

if function_declaration.parameters.required:

[GWeale]

Thanks for finding this issue. The fix is in for next release! If it does not work for you please reopen.