fix: Fix the Parameter Extraction node responded with incorrect attribute names when parameters were not extracted

Author: wangliang181230

apps/application/flow/step_node/parameter_extraction_node/impl/base_parameter_extraction_node.py

@@ -62,9 +62,9 @@ def generate_content(input_variable, variable_list):
     return value
 
 
-def json_loads(response, expected_fields):
+def json_loads(response, variable_list):
     if not response or not isinstance(response, str):
-        return {field: None for field in expected_fields}
+        return generate_example(variable_list)
 
     cleaned = response.strip()
 
@@ -79,7 +79,7 @@ def json_loads(response, expected_fields):
             return result
         except:
             continue
-    return generate_example(expected_fields)
+    return generate_example(variable_list)
 
 
 class BaseParameterExtractionNode(IParameterExtractionNode):