True is dimension has leader with shoulder, false otherwise. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 21.0.0.0 (21.1.1.109) 
  Since:  2021.1 
Syntax
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Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions InvalidOperationException | Dimension must have leader. -or- Thrown when: 
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