fix: append results to paragraph_list instead of replacing it

Author: liuruibin

apps/application/flow/step_node/document_split_node/impl/base_document_split_node.py

@@ -64,7 +64,7 @@ def execute(self, document_list, knowledge_id, split_strategy, paragraph_title_r
                     document_name_relate_problem_reference
                 )
 
-            paragraph_list = results
+            paragraph_list += results
 
         self.context['paragraph_list'] = paragraph_list
 
@@ -135,6 +135,5 @@ def get_details(self, index: int, **kwargs):
             'type': self.node.type,
             'status': self.status,
             'err_message': self.err_message,
-            'file_list': self.context.get('file_list'),
             'paragraph_list': self.context.get('paragraph_list', []),
         }