Found a bug with jsfg option with silence utterance

[Samuel Kitono]

Hey Brian,

Just to inform you when i try to set up your vocalkit with jsgf
grammar option it crashes if you use a short silence utterance.
Basically the problem is the "postNotificationOfRecognizedText"
function where hyp might be returned "null".

I kinda solved it by putting a constraint if hyp pointer is null then
post a blank message notification. Well just to let you know and
hopefully help other people as well. Otherwise your vocalkit is
awesome.

[Brian King]

Hey Samuel,
That's great that the library is helping you! There really hasn't
been much field testing to this project so I imagine there are a few
more similar bugs. Thanks for the heads up. Fork and fix if you
want!

Brian

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