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function _handleDeferred(deferred, result) {
    if (!result || !result.then) {
        // just to wrap objects which have no promises
        deferred.resolve();
    } else result.then(function (res) {
        deferred.resolve(res);
    }, function (err) {
        deferred.reject(err);
    }).catch(function (err) {
        deferred.reject(err);
    });
}