Why are there github projects with an empty list of contributors?

Question

In some Github projects the list of contributors is empty. What's the reason for this?

Example:

• Using Github API v3 — https://api.github.com/repos/rnauber/pipepanic-android/contributors
• Using Github Website — https://github.com/rnauber/pipepanic-android/graphs/contributors

Answer 1

If you clone that repo and look at git log, you'll see, that author of all commits is olg <x>. Github can't match e-mail address x to any of registered users.