md-select with ngModel freezes browser if other errors

[emin93]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Normal Angular2 unhandled error in console output

What is the current behavior?

Browser/tab freezes

What are the steps to reproduce?

Simple md-select with an ngModel and another component after the md-select which throws an error.

WARNING: If you open the following plunker template, your browser/tab WILL FREEZE (tested in Chrome and Safari)
Plunker template: https://embed.plnkr.co/BARX13/

[emin93]

Here is the Plunker link without preview, so code inspection is possible without tab freezing: https://plnkr.co/edit/BARX13?p=info

[crisbeto]

Great catch. This should be fixed in #2722, but I'll check if I can backport it to master as well.

[mrlund]

Seems related to #2716 - I think the issue is the infinite loop caused when another error on the page prevents the MdSelect from rendering its options, and thus passing the if (!this.options) clause.

    /**
     * Sets the select's value. Part of the ControlValueAccessor interface
     * required to integrate with Angular's core forms API.
     *
     * @param value New value to be written to the model.
     */
    MdSelect.prototype.writeValue = function (value) {
        var _this = this;
        if (!this.options) {
            // In reactive forms, writeValue() will be called synchronously before
            // the select's child options have been created. It's necessary to call
            // writeValue() again after the options have been created to ensure any
            // initial view value is set.
            Promise.resolve(null).then(function () { return _this.writeValue(value); });
            return;
        }
        this._setSelectionByValue(value);
    };

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