Revert "Propagate exception thrown in trajectory generator."
Revert "Propagate exception thrown in trajectory generator."

This reverts commit 2702645f193d1eb24e68516f370478a3a42da3ac.

The previous code should work identicaly. Maybe this was a workaround
that is no longuer necessary.

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