ERP5Workflow: fix boolean logic typo

product/ERP5Workflow/mixin/guardable.py

@@ -31,8 +31,8 @@ class GuardableMixin(object):
   security.declareObjectProtected(ManagePortal)
 
   def isGuarded(self):
-    return self.guard_expression and self.guard_group and \
-    self.guard_permission and guard_role
+    return self.guard_expression or self.guard_group or \
+    self.guard_permission or self.guard_role
 
   def checkGuard(self, security_manager, workflow, current_object, check_roles=True, **kw):
     """Checks conditions in this guard.