[PA] Concept ids with value 0 rendering as `Not specified` instead of value 0

Barchart xaxis tick name should be `0` instead of `Not specified`.

<img width="2551" height="1355" alt="Image" src="https://github.com/user-attachments/assets/23e0b9cf-cfdc-49c8-ba60-31e6dda663e5" />