Add fail-case for GitHub.Installation.repositories/1 when getting an access token
Add fail-case for GitHub.Installation.repositories/1 when getting an access token

The request was assumed to be succesful, so if it's not, for some reason, the app would break and, for example, a GithubAppInstallation would be stuck in the errored state when syncing repos.

crodriguez1a/code-corps-api,code-corps/code-corps-api,code-corps/code-corps-api,crodriguez1a/code-corps-api