[web-audio-api] Specify that audioprocess events should be dispatched to ScriptProcessorNodes when they're not connected to an output node (#203)

> Originally reported on W3C Bugzilla [ISSUE-21777](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21777) Tue, 23 Apr 2013 03:55:38 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

I think it would not make any sense to dispatch events to those nodes which are not connected to any output.  We should spec this one way or another, anyway.

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https://github.com/WebAudio/web-audio-api/issues/203