NPE in MediaDescription#setAttribute() because CandidateAttribute#attribute is null

[GoogleCodeExporter]

What steps will reproduce the problem?
- Create Agent and add audio stream, likle in test/ICE.java
- call IceSdpUtils#initSessionDescription()
- get 1st MediaDescription from new SessionDescription
- call MediaDescription.setAttribute("foo", "bar");

    Exception in thread "main" java.lang.NullPointerException
        at gov.nist.javax.sdp.MediaDescriptionImpl.setAttribute(MediaDescriptionImpl.java:505)

What version of the product are you using? On what operating system?
r360

Original issue reported on code.google.com by basini...@gmail.com on 5 Nov 2013 at 1:13

[GoogleCodeExporter]

From 36789bee673cfc56fa6f2bb40801147c48a502e2 Mon Sep 17 00:00:00 2001
From: Ilya Basin <basinilya@gmail.com>
Date: Fri, 8 Nov 2013 11:12:31 +0400
Subject: [PATCH] fix NPE in MediaDescription#setAttribute() because
 CandidateAttribute#attribute is null

http://code.google.com/p/ice4j/issues/detail?id=19
---
 src/org/ice4j/ice/sdp/CandidateAttribute.java |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/src/org/ice4j/ice/sdp/CandidateAttribute.java 
b/src/org/ice4j/ice/sdp/CandidateAttribute.java
index 35943de..7b2435a 100644
--- a/src/org/ice4j/ice/sdp/CandidateAttribute.java
+++ b/src/org/ice4j/ice/sdp/CandidateAttribute.java
@@ -38,6 +38,7 @@ public class CandidateAttribute extends AttributeField
     public CandidateAttribute(Candidate candidate)
     {
         this.candidate = candidate;
+        this.attribute = new NameValue(NAME, null);
     }

     /**
-- 
1.7.9

Original comment by basini...@gmail.com on 14 Nov 2013 at 2:41