Dynamic Material instance Does Not Return Scalar Parameter Values Array Correctly

It appears that MIDs do not return Scalar Parameter Values in an array. It will return the parameters during runtime but not in the construction script.

The steps are meant to show you that you can return the scalar parameter values when not using a MID.

1. Open attached project
2. Select the actor in the scene named "Test_Actor"
3. In the details panel check the bool "Print To Screen"
4. You should see "Length = 3 / First Param Name = ValueOne" printed
5. Next Check "Use MID?" in details panel
6. Check "Print To Screen" once again

RESULT
You will see "Length = 0 / First Param Name = none" printed to the screen.

EXPECTED
"Length = 3 / First Param Name = ValueOne" gets printed on screen.

Fix UE-51650

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