message: Fix VPAX NullReferenceException
diff: CompatibilityLevel = daxModel.CompatibilityLevel,
  DatabaseSize = databaseSize,
  AutoLineBreakStyle = autoLineBreakStyle,
  - ServerName = daxModel.ServerName.Name,
  + ServerName = daxModel.ServerName?.Name,
  ServerVersion = null,
  ServerEdition = null,
  ServerMode = null,
  