Fix T102045: Properties Editor Attribute panels errors when pinning mesh

When pinning a Mesh, we cannot rely on the context object.
Instead, use the context mesh now.
For vertexgroups names [which are still on the object API wise], this
means name collisions cannot be checked when pinning a Mesh (so print
this as a warning in that case)

Maniphest Tasks: T102045

Differential Revision: https://developer.blender.org/D16333

1 files changed, 5 insertions, 2 deletions

diff --git a/release/scripts/startup/bl_ui/properties_data_mesh.py b/release/scripts/startup/bl_ui/properties_data_mesh.py
index a775a3cfa1b..a6b97fbdc85 100644
--- a/release/scripts/startup/bl_ui/properties_data_mesh.py
+++ b/release/scripts/startup/bl_ui/properties_data_mesh.py
@@ -586,7 +586,7 @@ class DATA_PT_mesh_attributes(MeshButtonsPanel, Panel):
 
     def draw_attribute_warnings(self, context, layout):
         ob = context.object
-        mesh = ob.data
+        mesh = context.mesh
 
         unique_names = set()
         colliding_names = []
@@ -595,8 +595,11 @@ class DATA_PT_mesh_attributes(MeshButtonsPanel, Panel):
                 {"position": None, "shade_smooth": None, "normal": None, "crease": None},
                 mesh.attributes,
                 mesh.uv_layers,
-                ob.vertex_groups,
+                None if ob is None else ob.vertex_groups,
         ):
+            if collection is None:
+                colliding_names.append("Cannot check for object vertex groups when pinning mesh")
+                continue
             for name in collection.keys():
                 unique_names_len = len(unique_names)
                 unique_names.add(name)