Don't segfault if topobind doesn't get any command to execute, just do nothing and return success
Don't segfault if topobind doesn't get any command to execute, just do nothing and return success

git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@391 4b44e086-7f34-40ce-a3bd-00e031736276

BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc