video chat go gray and message enter connected!

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What steps will reproduce the problem?
1. get one computer without mic device
2. open the host:7070/redfire
3. click the 2way or 4way test

What is the expected output? What do you see instead?
it should disp a video chat,but remain on a gray screen with enter connected 
msg.

What version of the product are you using? On what operating system?
r20

Please provide any additional information below.
 svn/  trunk/ plugin/ video/ redfire_video.as
line 548 getMicrophone function
var mic:Microphone = Microphone.getEnhancedMicrophone();  
//maybe some computer has none mic
if(mic!=null){      
        mic.setUseEchoSuppression(true);
        mic.setLoopBack(false);
        mic.setSilenceLevel(10, 20000);
        mic.gain = 60;
}
        return mic;
line 118 handleconnection function
myMic = getMicrophone();
//maybe some computer has none mic
if(muMic != null ){
        myMic.rate = micSetRate;
}

Original issue reported on code.google.com by too...@gmail.com on 4 Jan 2013 at 8:13

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any solutions for this error????

Original comment by jeremy.b...@gmail.com on 29 Apr 2014 at 1:42

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I have te same problem, anybody has something?

Original comment by herbernl...@gmail.com on 8 Sep 2014 at 5:22

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I have te same problem, anybody has something?

Original comment by ahmad_aw...@hotmail.com on 1 Mar 2015 at 8:10