If we try to perform an operation on the GitHub API that is not allowed by lack of permission (for instance we authorized only to read public data access but we try to write or create something). We get an error like this:

The null object does not have a method 'map'. NoSuchMethodError: method not found: 'map' Receiver: null Arguments: [Closure: (dynamic) => dynamic]

And a 404 is logged in the JS console:

Failed to load resource: the server responded with a status of 404 (Not Found) https://api.github.com/repos/nicolasgarnier/test2/issues

Ideally we should get a meaningful error thrown instead of the NullPointerException.

FYI fixing this issue might be hard because I believe GitHub should be returning a 403 instead of a 404. This is a bug in the GitHub API and I've let GitHub know about it.