No output if variable missing
If a variable is not present in one or both of the input files, Glance doesn't emit any message at all, silently skipping it. This is true for
glance stats and I suspect other commands as well.
If the variable is only present in one of the two files, I would expect an warning message something like:
Skipping VARNAME: present in file1.nc but not file2.nc
If the variable isn't in either:
Skipping VARNAME: not present in either file.
The same for
glance inspectStats when the only file does not contain the named variable.