BUG: The max timestep must be >= 0.  When the file list is empty the max timestep becomes -1 which is wrong.
BUG: The max timestep must be >= 0.  When the file list is empty the max
timestep becomes -1 which is wrong.


liulion/mayavi,dmsurti/mayavi,dmsurti/mayavi,liulion/mayavi,alexandreleroux/mayavi,alexandreleroux/mayavi