Real life case when "[Q] Unhandled rejection reasons (should be empty):(no stack)" warning is thrown. At least on Win7 the warning is thrown ONLY in FF, and IE

gistfile1.js

var jsCAPI = new eZ.CAPI(
        'http://ez.git.local',
        new eZ.SessionAuthAgent({login: "admin", password: "ezpublish"}),
        {logRequests: true}
    ),
    jsPromiseCAPI = new eZ.PromiseCAPI(jsCAPI),
    promiseContentService = jsPromiseCAPI.getContentService(),
    promise = promiseContentService.loadSection("/api/ezp/v2/content/sections/1111abc");

promise.then(
    function (result) {

        console.log(result);

    },
    function (error) {

        console.log(error);

    }
);