Added condition for 403 HTTP Status

[alexanderrtaylor]

Added a condition for Issue 273 so that permisisons issues dont break your branch indexing completely

The goal is to fix #273 (comment) where the branch indexing was broken when the user didnt have access to a specific branch. Also it helps if there is any situation where a auth failure happens with something like API limits

Your checklist for this pull request

• [ ✅] Make sure you are requesting to pull a topic/feature/bugfix branch (right side) and not your master branch!
• [ ✅] Ensure that the pull request title represents the desired changelog entry
• [ ✅ ] Please describe what you did
• [ ✅ ] Link to relevant issues in GitHub or in Jenkins JIRA
• [ ❌ ] Did you provide a test-case? That demonstrates feature works or fixes the issue. - Currently there is no implementation for HTTP status checks in the test code which means a large wiremock implementation needs to be done (most likely) and that is going to require much more time investment. I would like to do it later though.