[I] Pipeline view broken after clicking "Add template" button twice

[via GitHub]

tenthe opened a new issue, #3460:
URL: https://github.com/apache/streampipes/issues/3460

   ### Body
   
   When a user clicks the "Add template" button twice, the pipeline view 
becomes broken. See attached screenshot for details.
   
   
![Image](https://github.com/user-attachments/assets/9192867b-6bf0-42ce-bf8c-bd921035f825)
   
   ### StreamPipes Committer
   
   I acknowledge that I am a maintainer/committer of the Apache StreamPipes 
project.


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