[reSIProcate] Security hotfix (see crash after receiving invalid Via line)

[Byron Campen]

	This bug allows an attacker to bring down a SIP element built on the  
resip stack by sending a request with a single empty Via header. This  
bug happens when we try to send a 400 to this malformed request. When  
this is fixed, I propose we backport the fix to the resiprocate-1.0  
branch, and release resiprocate-1.0.1 Any objections? (Or, additional  
bugs of this nature that have been found?)

Best regards,
Byron Campen
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