When including Oreo AVDs parseEmulatorsAvds crashes

[bsmithb2]

Hi,

When using the nativescript demo application, when I attempt to run tests using nativescript-dev-appium, the application crashes using parseEmulatorsAvds() in the AndroidController class.

Steps to repro:

1. Get hold of the Android Accelerated Oreo avd. You do this by installing Visual Studio for Mac Community Edition, and installing their default device.
2. Open the test repo https://github.com/bsmithb2/nativescript-mobile-bug
3. Run the repo in VS Code (or run.ts in anywhere really.
4. parsePlatforms on my Mac has android-27 and android-28 installed
5. parseEmulatorsAvds() crashes "cannot read property 'sdk' of undefined"

Cause: target=Google Inc.:Google Play:27 is not parsable compared to what it's expecting.
Expected: ignore the avd, or parse differently.

[setrar]

https://github.com/NativeScript/mobile-devices-controller/blob/master/lib/android-controller.ts#L727

    private static parseEmulatorsAvds() {
        const platforms = AndroidController.parsePlatforms();
        const avdsHomeDir = process.env["ANDROID_AVD_HOME"] || process.env["HOME"] || process.env["HOMEPATH"] || process.env["USERPROFILE:"];
        const emulators = new Array();

After setting ANDROID_AVD_HOME environment variable, which doesn't seem to be set by default, to whatever, I was able to  get rid of the sdk undefined issue

$ export ANDROID_AVD_HOME="???"
$ npm run e2e -- --runType android28 --verbose