Refactor conditional logic in SimplifiedProfileDelRefROHook a bit

This is a preparatory refactoring to ease introduction of a functional
change in the next changeset.

cubicweb_seda/hooks.py

@@ -310,9 +310,11 @@ class SimplifiedProfileDelRefROHook(hook.Hook):
         ref = self._cw.entity_from_eid(self.eidfrom)
         bdo = self._cw.entity_from_eid(self.eidto)
         if ref.cw_etype == 'SEDADataObjectReference' and bdo.cw_etype == 'SEDABinaryDataObject':
-            container = bdo.seda_binary_data_object[0] if bdo.seda_binary_data_object else None
-            if container and container.simplified_profile:
-                SimplifiedProfileDelRefROOp(self._cw, do_ref=ref, do=bdo)
+            if bdo.seda_binary_data_object:
+                container = bdo.seda_binary_data_object[0]
+                if not container.simplified_profile:
+                    return
+            SimplifiedProfileDelRefROOp(self._cw, do_ref=ref, do=bdo)
 
 
 class SimplifiedProfileDelRefROOp(hook.Operation):