fix: chat history might be empty in log detail view (#10905)

web/app/components/base/chat/utils.ts

@@ -127,19 +127,16 @@ function buildChatItemTree(allMessages: IChatItem[]): ChatItemInTree[] {
       lastAppendedLegacyAnswer = answerNode
     }
     else {
-      if (!parentMessageId)
+      if (
+        !parentMessageId
+        || !allMessages.some(item => item.id === parentMessageId) // parent message might not be fetched yet, in this case we will append the question to the root nodes
+      )
         rootNodes.push(questionNode)
       else
         map[parentMessageId]?.children!.push(questionNode)
     }
   }
 
-  // If no messages have parentMessageId=null (indicating a root node),
-  // then we likely have a partial chat history. In this case,
-  // use the first available message as the root node.
-  if (rootNodes.length === 0 && allMessages.length > 0)
-    rootNodes.push(map[allMessages[0]!.id]!)
-
   return rootNodes
 }