HDF5 viewer should fail gracefully if reading time-stepped Vec from non-time-stepped dataset and vice versa
@BarrySmith in !2172 (comment 233485497)
It definitely sounds like there should be some mechanism for error checking. If someone reads a file without time stepping but has set time stepping in the viewer it should error with a very useful error message and if they read a file with time checking but they have not set time checking in the viewer then it should generate a very useful message.