Empty string enum value breaks ReSpec

[luser]

WebIDL enums can have the empty string as a valid enumeration value, but ReSpec breaks on this (I think when it tries to assign the id based on the value). Simple example:

<dl title='enum Test' class='idl'>
  <dt></dt><dd>empty</dd>
  <dt>a</dt><dd>a</dd>
</dl>

I assume this needs to be fixed right around here:
https://github.com/w3c/respec/blob/develop/js/core/webidl-oldschool.js#L413

[marcoscaceres]

@iUser, just out of interest, which spec is using an empty enum?

[luser]

It's in Gamepad:
https://dvcs.w3.org/hg/gamepad/file/9a7e1a55d2a6/gamepad.html#l332

We had an attribute that was a string value, but I changed it to be an enum, and one of the existing string values was the empty string.

[marcoscaceres]

@luser, thanks!