603fca1e27
fix #32258 Errors in the issue was due to unhandled null check. so i fixed it. ### Detailed description for Issue & Fix To reproduce that issue, the comment must be deleted on Conversation tab. #### Before Delete <img width="1032" alt="image" src="https://github.com/user-attachments/assets/72df61ba-7db6-44c9-bebc-ca1178dd27f1"> #### After Delete (AS-IS) <img width="1010" alt="image" src="https://github.com/user-attachments/assets/36fa537e-4f8e-4535-8d02-e538c50f0dd8"> gitea already have remove logic for `timeline-item-group`, but because of null ref exception the later logic that removes `timeline-item-group` could be not be called correctly.