fix(extraction): resolve 'str' object has no attribute 'choices' error in LLMExtractionStrategy. Refs: #979

This patch ensures consistent handling of `response.choices[0].message.content` by avoiding redefinition
of the `response` variable, which caused downstream exceptions during error handling.

crawl4ai/extraction_strategy.py

@@ -680,7 +680,7 @@ class LLMExtractionStrategy(ExtractionStrategy):
                     block["error"] = False
             except Exception:
                 parsed, unparsed = split_and_parse_json_objects(
-                    response.choices[0].message.content
+                    response
                 )
                 blocks = parsed
                 if unparsed: