Clearing Material Parameter should set it to <By Category>
Undesired Current Revit Behavior:
The only way to set a material parameter to <By Category> is to literally type in "<By Category>"
And if you simply clear out a material parameter, Revit throws and error stating "Please enter a valid material"
Desired Revit Behavior:
Clearing out a material parameter should set it back to <By Category>
That way we don't have to type it in every time, and Revit can have one less error message type.
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