StaxUtils.copy(XMLStreamReader,XMLStreamWriter) does not preserve empty 
namespace URIs
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                 Key: CXF-3493
                 URL: https://issues.apache.org/jira/browse/CXF-3493
             Project: CXF
          Issue Type: Bug
          Components: Core
    Affects Versions: 2.4
            Reporter: aaron pieper


StaxUtils.copy(XMLStreamReader,XMLStreamWriter)  fails to copy documents 
correctly if they declare a namespace with a zero-length URI. In some cases, 
this URI is frivolous, but in other cases it is important, such as in the 
following document:

<foo xmlns="http://example.com";><bar xmlns=""/></foo>

StaxUtils will remove this zero-length URI, resulting in the following XML 
document:

<foo xmlns="http://example.com";><bar/></foo>

These two documents are not equivalent. In the first document, bar assumes the 
"empty namespace". In the second document, "bar" assumes the example.com 
namespace.

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