Unsuccessful requests throws Error instead of Exception

[SimonCockx]

When a GitHub API call returns a non-success status (e.g., 404 NOT FOUND), Jcabi throws an AssertionError. This however is not an Exception, but rather an Error, which is against the guidelines of the Java spec.

To quote the Oracle docs:

Error is the superclass of all the exceptions from which ordinary programs are not ordinarily expected to recover.

We would like to handle this gracefully in our application though. An ugly workaround is to catch this AssertionError, but the Java specification clearly states that this is against the goal of Errors. This should be an (unchecked?) exception instead.