RFC 3261 Accept-Language change to allow empty

"Rawsthorne, Alan \(Alan\)" <[email protected]>
Newsgroups gmane.ietf.sip
Message-ID <F2B3190B2D8D0640A6C008A882001E3702367A7C@ILEXC3U02.ndc.lucent.com>
      
What is the purpose of the RFC3261 change that allowed 
Accept-Language: 
 What does a language set to nothing mean?

Some systems (older?) reject responses with empty value
Accept-Language:
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