Remove benign but frightening error messages from UObject remote output.
Remove benign but frightening error messages from UObject remote output.

	* share/urbi/uobject.u(external.'var'): Handle correctly the case
	  where the var exists but is void.

aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi