[Radiant] Checking for other extensions and gems

[Sean Cribbs]

Check for the existence of the Shards module:

raise "The Shards extension is required and must be loaded first!" 
unless defined?(Shards)

Sean

Chris Parrish wrote:
> I'm writing an extension that depends on shards.  I'd like to check for 
> it and raise a useful error message when my extension is initialized.
>
> Any suggestions as to the best way to do that?
>
> -Chris
>
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