[CXF-4879] Check for empty strings for the Proxy properties.

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1453541 13f79535-47bb-0310-9956-ffa450edef68
[CXF-4877] Fix problems where extensors may be adding namespace declarations into the root wsdl instead of the current wsdl when dealing with services that generated imports.

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1453542 13f79535-47bb-0310-9956-ffa450edef68