If there is no active profile, the packageinstaller should not attempt to install config

[SimonDarksideJ]

XRTK - Mixed Reality Toolkit Bug Report

Describe the bug

If there is no ActiveProfile, the package Installer should not attempt to automatically configure the profiles.

If it attempts to install the configuration, this results in a misconfigured system that is tricky to revert.

To Reproduce

1. Install XRTK.SDK (which includes core)
2. Install XRTK.Oculus
3. Click yes when prompted

Expected behavior

Based on the current pattern, the scene should not have anything new configured if a MixedRealityToolkit GO is not present.

Actual behavior

A MixedRealityToolkit GO is added and the configuration is mixed and does not work for the new platform. (SupportedPlatforms for instance are set to None)