[PR] fix: check if handle has been initialized before closing [datafusion-comet]

[via GitHub]

wForget opened a new pull request, #1554:
URL: https://github.com/apache/datafusion-comet/pull/1554

   ## Which issue does this PR close?
   
   
   Part of #1553
   
   
   ## Rationale for this change
   
   Check that the handle is initialized before closing to avoid native thread 
panic.
   
   ## What changes are included in this PR?
   
   <!--
   There is no need to duplicate the description in the issue here but it is 
sometimes worth providing a summary of the individual changes in this PR.
   -->
   
   ## How are these changes tested?
   
   before this:
   
![image](https://github.com/user-attachments/assets/1daf70ee-0af6-452e-adf2-d5183a33bdb7)
   
   after this:
   
![image](https://github.com/user-attachments/assets/f8f50ab4-043e-4e75-9fa4-88c7f218f5e0)
   


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