Experiment tag validation is not working in [ph3-lab-mgmt](https://github.com/virtual-labs/ph3-lab-mgmt) script. When an experiment is being built with a tag that doesn't exists, the script outputs a `throw error` instead of displaying the error `Tag doesn't exist`. <img width="278" alt="image" src="https://user-images.githubusercontent.com/24794698/228239597-9238baf2-bbe6-4b05-86d1-ac1b1451fed5.png">
Experiment tag validation is not working in ph3-lab-mgmt script.
When an experiment is being built with a tag that doesn't exists, the script outputs a
throw errorinstead of displaying the errorTag doesn't exist.