Improve Score Reporting: Branch-Protection check fails with -1

[azeemshaikh38]

Branch-Protection fails with -1 for multiple reasons:

• lookup of a branch name that no more exists on the repository
• unable to locate the branch even though it existed (maybe similar to #1320)
• the main branch had a different name than the “main”

None of these seem reasonable cases to be returning -1. Need to fix this.