The SILO reader was experiencing a crash when compiled with the latest version of the SILO library (4.11). This was caused by a metadata load that failed to capture variable names that were later expected to be found. The appropriate metadata is now loaded.

This fixes a problem that has been reported a number of times: https://gitlab.kitware.com/paraview/paraview/-/issues/22373 and https://github.com/LLNL/Silo/issues/445.