Doesn't display the overlay until you can close Vuforia.

[Stending]

Description

The overlay will wait that Vuforia to be closable before displaying

Motivation and Context

After some use of the plugin, we noticed that if you close vuforia a bit to soon, the plugin completly crash. So we made the overlay to wait until Vuforia can be closed.

How Has This Been Tested?

Tested on iPad and iPod Touch

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

  Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [x] I have read the CONTRIBUTING document.

[mattrayner]

Does this issue also exist in Android?

[Stending]

I just tested it, it's not needed on android!

[mattrayner]

Cool - if you rebase from mast I'll get it merged in

[Stending]

Done!