The default-constructed Entity is invalid.
Namespace: Autodesk.Revit.DB.ExtensibleStorage
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2012
Syntax
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Remarks
Invalid entities may be used as token values. E.g., setting an invalid subentity is equivalent to deleting the stored one.