fix: empty stdout/stderr produces str(content) instead of empty logs

When both stdout and stderr are empty strings, the `if parts else
str(content)` fallback produced the raw dict representation as logs.
Drop the fallback so logs is correctly empty.

litellm/llms/anthropic/chat/handler.py

@@ -711,7 +711,7 @@ class ModelResponseIterator:
                     parts.append(content["stdout"])
                 if content.get("stderr"):
                     parts.append(f"STDERR: {content['stderr']}")
-                logs = "".join(parts) if parts else str(content)
+                logs = "".join(parts)
             else:
                 logs = str(content)
             tool_input = self._server_tool_inputs.get(call_id, {})

litellm/llms/anthropic/chat/transformation.py

@@ -1775,7 +1775,7 @@ class AnthropicConfig(AnthropicModelInfo, BaseConfig):
                             parts.append(content["stdout"])
                         if content.get("stderr"):
                             parts.append(f"STDERR: {content['stderr']}")
-                        logs = "".join(parts) if parts else str(content)
+                        logs = "".join(parts)
                     else:
                         logs = str(content)
                     code_interpreter_results.append(