Fix for use of AMD define without name/dependencies

[elerch]

Spin.js 
(https://github.com/fgnass/spin.js/blob/gh-pages/spin.js#L316)

uses define without any dependencies, so deps becomes undefined. This 
usage appears valid based on the AMD definition: 

http://wiki.commonjs.org/wiki/Modules/AsynchronousDefinition

While spin.js' use of define is relatively not useful, it's valid.
This change will accommodate modules that work in this manner.

[jrburke]

Almond only works with built files, files that have all dependencies inlined and given names (string IDs for the first define() call). So the pathway you hit is only hit if the tool used to bundle spin.js with almond failed to insert a string ID for spin's define() call.

Can you give more info on how you generated a built file with almond and spin that resulted in no name insertion for spin? The bug is likely in that process.

Closing this for now, but we can reopen if the built file does end up with the string ID in it for spin's define() call. We should continue discussion in this ticket too, to resolve how this code branch was reached.