Part name used in sub assembly are now properly display

Step view have CoerceView set to True by default

ahb_cmd_new_step.py

@@ -70,6 +70,7 @@ class AHB_New_Step:
 		
 		view = doc.addObject('TechDraw::DrawViewPart', 'View')
 		view.Perspective = False
+		view.CoarseView = True
 		view.addProperty("App::PropertyString", "Assembly_handbook_PreviousStepView", "Assembly_handbook")
 		view.addProperty("App::PropertyBool", "Assembly_handbook_RasterView", "Assembly_handbook")
 		view.Assembly_handbook_RasterView = raster_view

ahb_techdraw_extensions.py

@@ -542,6 +542,8 @@ class TechDrawExtensions:
 			return part.Document.Name + '#' + part.Name
 	
 	def isPartLink(self, obj):
+		if obj is None:
+			return False
 		if obj.TypeId == 'App::Link':
 			return True
 		if obj.TypeId == 'Part::FeaturePython' and hasattr(obj, 'LinkedObject'): # variant link
@@ -550,7 +552,7 @@ class TechDrawExtensions:
 		
 	def getPartDisplayName(self, obj):
 		if self.isPartLink(obj):
-			linked_obj = obj.LinkedObject
+			linked_obj = obj.SourceObject if hasattr(obj, 'SourceObject') else obj.LinkedObject
 			if 'Assembly_handbook_PartDisplayName' in linked_obj.PropertiesList:
 				return linked_obj.Assembly_handbook_PartDisplayName
 			else: