====== lmbPropertyOptionalCommand ======

lmbPropertyOptionalCommand is a child class of [[lmbObservableCommand]] and allows you to insert "if" conditional logic into the command chain. lmbPropertyOptionalCommand accepts dataspace object and property name in constructor.

lmbPropertyOptionalCommand triggers onPerform event only if the dataspace has not null specified property. lmbPropertyOptionalCommand is mostly used with [[lmbFormCommand]] to support multi-action forms. See [[lmbFormCommand]] description page for example of lmbPropertyOptionalCommand usage.