When smtlib checks happen, handle the case of no sample values.

If an smtlib checker doesn't generate sample values, use an empty array so
the system can handle everything properly.

git-svn-id: https://groke.mcmaster.ca/svn/grad/colin/branches/TableTool_javization@11084 57e6efec-57d4-0310-aeb1-a6c144bb1a8b