- Fix sync streaming handler: check accumulated_tool_args (from deltas)
instead of only checking tool_calls from last chunk. This mirrors the
async streaming handler fix.
- Add isinstance(tool_calls, list) checks in non-streaming handlers for
type safety (prevents false positives from auto-created MagicMock attrs).
- Update test_handle_streaming_tool_calls_no_available_functions to verify
tool calls are returned (not discarded) when available_functions is None,
matching the corrected behavior from issue #4788.
- Emit LLM completion event before returning accumulated tool calls from
streaming handler.
Co-Authored-By: João <joao@crewai.com>
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