Hide unpopulated enumerated static mesh variables from enumerations list in Viewport Details?

Can I hide an enumeration linked to a static mesh variable when the variable is set to None (empty)?

For example, I have a master Blueprint with enumerations of static meshes. From this Blueprint, I create a child blueprint, populate some of the static mesh slots with static meshes but also leave some of them empty depending on the range of static meshes I want available for the given child blueprint.

However, when I drop the child blueprint into the scene, all of the enumerations — even those with unpopulated static mesh slots — show up in the drop down menu in the Viewport’s Details pane.

Is it possible to hide these unpopulated static mesh variables from the enumerations list?

Thanks!