Don't allow the creation of empty pull requests (No changed files)

[Vicropht]

Is your feature request related to a problem? Please describe.
When I create a pull request through the pipeline, there is no check to see if the PR has any changes, this leads to a blank PR with no file changes. The web version doesn't allow the creation of empty PRs, so it would make sense to be the same in the CLI.

Describe the solution you'd like
Do not allow the creation of PRs that have no changes.

[yonzhan]

@jiasli for awareness

[Amotti6]

Having the same issue as reported, are there any progress for this feature?

[andrzejmartyna]

I think otherwise i.e. I wish an empty PR could be created from UI too.
An empty PR would be valuable to just provide additional feedback/confirmation from the team (e.g. through PR templates).