Global parameters can have null descriptions (names)

[cmutel]

This is confusing (especially selecting them afterwards). It doesn't seem like it is editable afterwards, either.
Pop-up uses "Description", but table uses "Name".

[pjamesjoyce]

I've added some client side validation to stop users from being able to enter null values where they shouldn't. You now get a message telling you what you need to do.

I've also made is so IDs that can't be parsed are automatically changed to useable ones (e.g. Useless Parameter! --> useless_parameter) and changed the form to refer to ID and Name instead of Name and Description.

[pjamesjoyce]

Link this issue to openjournals/joss-reviews#339