Deferred instrumentation logs error when downstream promise handles error

[Kris Zyp]

If you define a downstream error handler, errors/rejections can still be reported as unhandled. For example:

    var deferred = new Deferred();
    // provide an error handler downstream
    deferred.then(function(){}).then(null, function(){});
    // throw error, it is handled, but shows up as unhandled.
    deferred.reject(new Error());

[Kris Zyp <kriszyp@…>]

In ebaf3eddc8d8ceb80da078f21269d0cad0235b6f/dojo:

Error: Processor CommitTicketReference failed

Unsupported version control system "git": Can't find an appropriate component, maybe the corresponding plugin was not enabled? 

[Kris Zyp]

As far as testing, I don't think instrumentation has any tests, and this is just a tweak in when we report errors.

[Colin Snover]

master ebaf3eddc8d8ceb80da078f21269d0cad0235b6f 1.10 e16adb441dea583492415dc79f240a14a3485ea0 1.9 d0820cab82a94db1c0b81cfaa100c1a8154302e8 1.8 df0fff25015e5389de35f0d2a8929cdbd4c06f77