fix: MCP calls node, workflow error after form recall (#3738)

Author: shaohuzhang1

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

@@ -14,8 +14,6 @@ def save_context(self, details, workflow_manage):
         self.context['result'] = details.get('result')
         self.context['tool_params'] = details.get('tool_params')
         self.context['mcp_tool'] = details.get('mcp_tool')
-        if self.node_params.get('is_result', False):
-            self.answer_text = details.get('result')
 
     def execute(self, mcp_servers, mcp_server, mcp_tool, tool_params, **kwargs) -> NodeResult:
         servers = json.loads(mcp_servers)