fix: Fix the issue of null pointer exception when get reference content

Author: wangliang181230

apps/application/flow/step_node/ai_chat_step_node/impl/base_chat_node.py

@@ -376,7 +376,7 @@ def handle_variables(self, tool_params):
     def get_reference_content(self, fields: List[str]):
         return str(self.workflow_manage.get_reference_field(
             fields[0],
-            fields[1:]))
+            fields[1:])) if fields else ''
 
     @staticmethod
     def get_history_message(history_chat_record, dialogue_number, dialogue_type, runtime_node_id):

apps/application/flow/step_node/direct_reply_node/impl/base_reply_node.py

@@ -32,7 +32,7 @@ def generate_reply_content(self, prompt):
     def get_reference_content(self, fields: List[str]):
         return str(self.workflow_manage.get_reference_field(
             fields[0],
-            fields[1:]))
+            fields[1:])) if fields else ''
 
     def get_details(self, index: int, **kwargs):
         return {

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

@@ -42,7 +42,7 @@ def save_context(self, details, workflow_manage):
         self.context['exception_message'] = details.get('err_message')
 
     def get_reference_content(self, fields: List[str]):
-        return self.workflow_manage.get_reference_field(fields[0], fields[1:])
+        return self.workflow_manage.get_reference_field(fields[0], fields[1:]) if fields else None
 
     def execute(self, document_list, knowledge_id, split_strategy, paragraph_title_relate_problem_type,
                 paragraph_title_relate_problem, paragraph_title_relate_problem_reference,

apps/application/flow/step_node/mcp_node/impl/base_mcp_node.py

@@ -60,7 +60,7 @@ def handle_variables(self, tool_params):
     def get_reference_content(self, fields: List[str]):
         return self.workflow_manage.get_reference_field(
             fields[0],
-            fields[1:])
+            fields[1:]) if fields else None
 
     def get_details(self, index: int, **kwargs):
         return {

apps/application/flow/step_node/search_document_node/impl/base_search_document_node.py

@@ -24,7 +24,7 @@ def save_context(self, details, workflow_manage):
         self.context['exception_message'] = details.get('err_message')
 
     def get_reference_content(self, fields: List[str]):
-        return self.workflow_manage.get_reference_field(fields[0], fields[1:])
+        return self.workflow_manage.get_reference_field(fields[0], fields[1:]) if fields else None
 
     def execute(self, knowledge_id_list: List, search_mode: str, search_scope_type: str, search_scope_source: str,
                 search_scope_reference: List, question_reference: List, search_condition_type: str,

apps/application/flow/step_node/search_knowledge_node/impl/base_search_knowledge_node.py

@@ -71,7 +71,7 @@ def save_context(self, details, workflow_manage):
         self.context['exception_message'] = details.get('err_message')
 
     def get_reference_content(self, fields: List[str]):
-        return self.workflow_manage.get_reference_field(fields[0], fields[1:])
+        return self.workflow_manage.get_reference_field(fields[0], fields[1:]) if fields else None
 
     def execute(self, knowledge_id_list, knowledge_setting, question, show_knowledge, search_scope_type,
                 search_scope_source,

apps/application/flow/step_node/variable_assign_node/impl/base_variable_assign_node.py

@@ -109,7 +109,7 @@ def execute(self, variable_list, **kwargs) -> NodeResult:
     def get_reference_content(self, fields: List[str]):
         return self.workflow_manage.get_reference_field(
             fields[0],
-            fields[1:])
+            fields[1:]) if fields else None
 
     def get_details(self, index: int, **kwargs):
         return {