[Bug] Unable to update challenge due to challenge validation


- the expected behaviour
The challenge should be updated without a issue
- the observed behaviour 
After deleting challenge phase 1 , we get this error https://github.com/Suryansh5545/TestPhase/actions/runs/6113014452/job/16591633990
- steps to reproduce the problem
Delete the challenge phase 1 then try to update the challenge.
