`bundle exec setup android` should fail if Java is not installed

[stephen-puiszis]

Adding this for later for me to fix.

The setup script will still finish if you don't have Java installed.

== Updating Android Packages
No Java runtime present, requesting install.
touch: /Users/stephen/.android/repositories.cfg: No such file or directory
No Java runtime present, requesting install.
== Creating virtual device
No Java runtime present, requesting install.
Add the following to your environment file:
--------------------------------------------
export ANDROID_SDK_ROOT=/usr/local/share/android-sdk
export ANDROID_HOME=$ANDROID_SDK_ROOT
export ANDROID_NDK_HOME=$ANDROID_SDK_ROOT/ndk-bundle

export PATH=$PATH:$ANDROID_SDK_ROOT/emulator
export PATH=$PATH:$ANDROID_SDK_ROOT/tools
export PATH=$PATH:$ANDROID_SDK_ROOT/platform-tools
--------------------------------------------
true
Setup finished 🚀