add context property force_store_value

tiramisu/option/optiondescription.py

@@ -170,10 +170,12 @@ class CacheOptionDescription(BaseOption):
 
     def impl_build_force_store_values(self,
                                       config_bag: ConfigBag) -> None:
-        commit = False
         if not hasattr(self, '_cache_force_store_values'):
             raise ConfigError(_('option description seems to be part of an other '
                                 'config'))
+        if 'force_store_value' not in config_bag.properties:
+            return
+        commit = False
         values = config_bag.context.cfgimpl_get_values()
         for subpath, option in self._cache_force_store_values:
             if not values._p_.hasvalue(subpath):