Copy-pasting material properties between different materials throws exceptions.

This is a regression from: [Internal link]

Steps to reproduce:

• Add TMP to the project
• Import Essential Resources, Examples, and Extras (Window/TextMesh Pro/Import …)
• Create a new scene with 2 TMP TextObject
• The first one,  change its material preset to LiberationSans SDF - Metalic .
• Copy the material properties from the first one to the second one

Expected: No errors are thrown even if the destination is missing some properties
Actual: Exceptions are thrown