Set multiple material parameters to null

[bvs1982]

Set Material of Category to Null

I try to set the material of a Revit Category to Null / Empty. Used the “Set SubCategory Properties” from GeniusLoci, what works well for assigning materials. But how to “deassign”? Inside Revit I can use the Button in the lower left. But how to do this with Dynamo??? THX [grafik]