Check that the loaded family has its content document. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 19.0.0.0 (19.0.0.405) 
Syntax
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Parameters
- ADoc
-  Type:  Autodesk.Revit.DB Document  
 The host document.
- familyId
-  Type:  Autodesk.Revit.DB ElementId  
 The id of the family to check.
Return Value
Returns true if the family has its content document.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |