Prevent to use the map route until the map is ready and the route fetched

[Guardiola31337]

• Prevents to use the mapRoute until the map is ready and the route fetched
• Hides the launchNavigationFab until a route is fetched to avoid Null directionsRoute NullPointerException 👇

07-20 16:14:17.712 6771-6771/com.mapbox.services.android.navigation.testapp E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.mapbox.services.android.navigation.testapp, PID: 6771
    java.lang.NullPointerException: Null directionsRoute
        at com.mapbox.services.android.navigation.ui.v5.AutoValue_NavigationViewOptions$Builder.directionsRoute(AutoValue_NavigationViewOptions.java:288)
        at com.mapbox.services.android.navigation.testapp.activity.navigationui.DualNavigationMapActivity.launchNavigation(DualNavigationMapActivity.java:271)
        at com.mapbox.services.android.navigation.testapp.activity.navigationui.DualNavigationMapActivity.lambda$onCreate$0$DualNavigationMapActivity(DualNavigationMapActivity.java:85)
        at com.mapbox.services.android.navigation.testapp.activity.navigationui.DualNavigationMapActivity$$Lambda$0.onClick(Unknown Source)
        at android.view.View.performClick(View.java:5198)
        at android.view.View$PerformClick.run(View.java:21147)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5417)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Closes #1130

[danesfeder]

Thanks for the quick fix on that @Guardiola31337 🚢