Zousan is upset: Uncaught rejection when insufficient script rights (minor)

Thought this was amusing and would let you know. Minor, but perhaps not for Zousan?
```
PS> ember-cli-windows
ember-cli-windows v2.1.6
Scripts cannot be executed on this system.
To fix, please run the command below using PowerShell as Administrator and try again:
Set-ExecutionPolicy Unrestricted -Scope CurrentUser -Force
**You upset Zousan. Please catch rejections: undefined null**
```