allow for missing short_description

[jr2730]

Please be gentle :-)

This is my first GitHub public PR.

The original code works great when All-Is-Good. However, when one of several different issues is WRONG, you get a less-than-pleasant experience.

If either short_description or description is missing, you get "parse failed" error (I think). VERY painful to debug.

Also, what seems to be legal YAML wasn't handled well.

And I couldn't figure out how to fix any of those; but this PR seems to handle if a short_description is missing.