Deleted a trailing whitespace (flake8).

analytic_structure.py

@@ -210,7 +210,7 @@
     @api.model
     def get_ordering_dimensions(self, model):
         """Return a dictionary that contains the identifier (keys) and the list
-        of the ordering numbers (values) of the analytic dimensions linked to 
+        of the ordering numbers (values) of the analytic dimensions linked to
         the given model.
         """