fix: non-dict tool result content falls back to outputs=None

Replace str(content) fallback with empty string so non-dict content
(e.g. list-shaped text_editor results) produces outputs=None instead
of raw Python object representations in logs.

litellm/llms/anthropic/chat/handler.py

@@ -713,7 +713,7 @@ class ModelResponseIterator:
                     parts.append(f"STDERR: {content['stderr']}")
                 logs = "".join(parts)
             else:
-                logs = str(content)
+                logs = ""
             tool_input = self._server_tool_inputs.get(call_id, {})
             code = tool_input.get("command", "") if isinstance(tool_input, dict) else ""
             log_outputs = (

litellm/llms/anthropic/chat/transformation.py

@@ -1777,7 +1777,7 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
                             parts.append(f"STDERR: {content['stderr']}")
                         logs = "".join(parts)
                     else:
-                        logs = str(content)
+                        logs = ""
                     log_outputs = (
                         [OutputCodeInterpreterCallLog(type="logs", logs=logs)]
                         if logs