NonNodeData is not a required key

[IlleNilsson]

Beside AllNode, wich is required the keys can be named to whatever you want.

Expected Behavior

Merge should work for any kind of keys AllNodes and others.

Current Behavior

Only works for AllNodes and NonNodeData key

Possible Solution

Merge AllNodes and any other keys

Steps to Reproduce (for bugs)

1. Create another key not named NonNodeData
2. Try to merge the two files

Your Environment

• Module version used: All
• Operating System and PowerShell version: Windows 10, PowerShell 5.1