librarian(bug): librarian release init fails with `failed to fetch conventional commits for library` for recently configured library

[parthea]

I ran librarian release init on a branch with PR googleapis/google-cloud-python#14791 however the command failed with error failed to find tag google-cloud-gkerecommender-v0.0.0: tag not found.

partheniou@partheniou-vm-3:~/git/google-cloud-python$ librarian release init
time=2025-10-21T09:28:27.913Z level=INFO msg="Temporary working directory" dir=/tmp/librarian-3061479323
time=2025-10-21T09:28:27.914Z level=INFO msg="repo not specified, using current working directory as repo root" path=/usr/local/google/home/partheniou/git/google-cloud-python
time=2025-10-21T09:28:27.914Z level=INFO msg="Opening repository" dir=/usr/local/google/home/partheniou/git/google-cloud-python
time=2025-10-21T09:28:35.963Z level=INFO msg="source not specified, skipping service config population"
time=2025-10-21T09:28:35.966Z level=INFO msg="Initiating a release" dir=/tmp/librarian-3061479323/output
time=2025-10-21T09:28:35.968Z level=INFO msg="failed to fetch conventional commits for library, google-cloud-gkerecommender: failed to get commits for library google-cloud-gkerecommender: failed to find tag google-cloud-gkerecommender-v0.0.0: tag not found"

A potential solution could be to skip searching for git tags when the library version is 0.0.0