Test Runner sometimes crashes on empty case directories

[mhucka]

Lucian reports the following (via Pivotal Tracker issue 168714324:

When creating new tests, I will sometimes forget to add a results file. When that happens, if I click on that test in the runner, it stops unexpectedly and exits. Not a huge issue, and it won't ever be true for released tests, but could be nice to not actually crash, for people like me creating tests, or for people who are manually manipulating the tests for whatever reason.

My general process is:

• Create a new directory.
• Create an SBML file in that directory.
• Run my 'generateTestsFrom' program that creates a .m and a settings file.
• Fill out the blanks in the newly-generated files.
• Create a results file.
• Launch the runner.
  Except 'launch the runner' sometimes happens any time after step 1 if I lose track of where I was ;-)