Propagate exception thrown in trajectory generator.
Propagate exception thrown in trajectory generator.

Exceptions thrown in the trajectory generator were not propagated
outside, and were repeated at "every" cycle.

	* share/urbi/trajectory-generator.u (run): Propagate any
	exception thrown in the trajectory generator.

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