fixup! ERP5Workflow: DC Workflows are now ERP5 objects (!1378).

If state_permission_role_list_dict is not yet set in a Workflow State, the UI displays permission/role table with all unchecked.
Once we save it in Permissions tab without checking anything, state_permission_role_list_dict will become like
  {'Access contents information': (),
   'Add portal content': (),
   'Modify portal content': (),
   'View': ()}
This commit will make the behaviour same for these 'before save' and 'after save' cases as the UI displays exactly same.

product/ERP5Type/Core/WorkflowState.py

@@ -113,9 +113,9 @@ class WorkflowState(IdAsReferenceMixin("state_"),
     """
     return the permission/roles dict
     """
-    if self.state_permission_role_list_dict is None:
-      return {}
-    return dict(self.state_permission_role_list_dict.items())
+    state_permission_role_list_dict_get = (self.state_permission_role_list_dict or {}).get
+    return {k: state_permission_role_list_dict_get(k, ())
+            for k in self.getWorkflowManagedPermissionList()}
 
   security.declareProtected(Permissions.ModifyPortalContent,
                             'setPermission')