Fix of an unreported bug: when changing the radius of sticks that are in the...

Fix of an unreported bug: when changing the radius of sticks that are in the form of cylinders, they were marked as
invisible after the change. This should only be done for the representative cylinder and cup object of those sticks,
which are in a dupliverts structure.

io_mesh_atomic/utility_panel.py

@@ -319,10 +319,15 @@ def modify_objects(action_type,
                                     ('CUP'      in atom.name.upper() or
                                      'CYLINDER' in atom.name.upper())):
 
-        # Make the cylinder or cup visible first, otherwise one cannot
-        # go into EDIT mode. Note that 'atom' here is in fact a 'stick'
-        # (cylinder or cup).
-        atom.hide_set(False)
+        # For dupliverts structures only: Make the cylinder or cup visible
+        # first, otherwise one cannot go into EDIT mode. Note that 'atom' here
+        # is in fact a 'stick' (cylinder or cup).
+        # First, identify if it is a normal cylinder object or a dupliverts
+        # structure. The identifier for a dupliverts structure is the parent's
+        # name, which includes "_sticks_mesh"
+        if "_sticks_mesh" in atom.parent.name:
+            atom.hide_set(False)
+
         bpy.context.view_layer.objects.active = atom
         bpy.ops.object.mode_set(mode='EDIT', toggle=False)
         bm = bmesh.from_edit_mesh(atom.data)
@@ -343,8 +348,11 @@ def modify_objects(action_type,
             v.co[1] = ((v.co[1] - center[1]) / radius) * radius_new + center[1]
 
         bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
-        # Hide again the representative stick (cylinder or cup).
-        atom.hide_set(True)
+        # Hide again the representative stick (cylinder or cup) if it is a
+        # dupliverts structure.
+        if "_sticks_mesh" in atom.parent.name:
+            atom.hide_set(True)
+
         bpy.context.view_layer.objects.active = None
 
     # Replace atom objects