Check if the "name" key exists before access
Check if the "name" key exists before access

In some cases (in particular, HDF5 files), the "name" key does not
exist, and a key error was occurring here. Check that the "name"
key exists before trying to access it.

Signed-off-by: Patrick Avery <743342299f279e7a8c3ff5eb40671fce3e95f13a@kitware.com>

OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz