Fixed issue when no time steps are available in the file.

The TimeStepRange member variable would have values of {0,-1}
if no time steps were in the input file which also caused
reading from out of bounds of an array.

Change-Id: I428b2b1826b66f30b2d9e859d6e810aee65d405d
Merge topic 'vtkXMLReader_fix_time_range' into master

dfb5738d Fixed issue when no time steps are available in the file.