remove workaround thats not needed anymore and could cause a python error when linking a mesh with keys to an object.

release/scripts/ui/properties_data_mesh.py

@@ -155,12 +155,7 @@ class DATA_PT_shape_keys(DataButtonsPanel):
 
         ob = context.object
         key = ob.data.shape_keys
-        if key and len(key.keys):
-            # this is so that we get the active shapekey from the
-            # shapekeys block, not from object data
-            kb = key.keys[ob.active_shape_key.name]
-        else:
-            kb = None
+        kb = ob.active_shape_key
         wide_ui = context.region.width > narrowui
 
         enable_edit = ob.mode != 'EDIT'