[PR] [INLONG-10973][Dashboard] A wrong error occurs in data preview [inlong]

[via GitHub]

wohainilaodou opened a new pull request, #10974:
URL: https://github.com/apache/inlong/pull/10974

   
   
   Fixes #10973 
   
   ### Motivation
   A wrong error occurs in data preview
   ### Modifications
   
   Add non-null judgment of data
   ### Verifying this change
   before:
   
![image](https://github.com/user-attachments/assets/952a8e78-9f86-458b-9cc5-8527a9fa3e0b)
   
   
![image](https://github.com/user-attachments/assets/38c808ff-c515-4357-8ded-3401ac4025fa)
   after:
   
![image](https://github.com/user-attachments/assets/a69f459e-51f6-4886-97d8-2a4051f2614a)
   
   


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