Possible invalid argument for foreach in CommerceContentEntityStorageSchema

We use a commerce_cardpointe module which defines an entity commerce_cardpointe_terminal. There is no field_indexes definition in the annotation since this is an optional key. But CommerceContentEntityStorageSchema doesn't check it and throws warnings

[warning] foreach() argument must be of type array|object, null given CommerceContentEntityStorageSchema.php:21