Fix whitespace handling in _has_meaningful_content function

• Preserve newlines and spaces as content
• Remove .strip() call on strings
• Treat all non-empty strings as meaningful
• Update logic comment for clarity
• Fix edge case with whitespace-only text

litellm/litellm_core_utils/model_response_utils.py

@@ -84,7 +84,9 @@ def _has_meaningful_content(value: Any) -> bool:
         return False
 
     if isinstance(value, str):
-        return len(value.strip()) > 0
+        # Don't strip whitespace - preserve all content including newlines, spaces, etc.
+        # Even pure whitespace characters like '\n' or ' ' are meaningful content
+        return len(value) > 0
 
     if isinstance(value, (list, dict)):
         return len(value) > 0