XPath: Fixed empty string literals, don't add empty nodes/attributes in node sets (i.e. for self axis)
XPath: Fixed empty string literals, don't add empty nodes/attributes in node sets (i.e. for self axis)

git-svn-id: febc13fe83507aab7d46ca3748413bb6c67ab8eb@172 99668b35-9821-0410-8761-19e4c4f06640

zeux/pugixml,zeux/pugixml,zeux/pugixml,zeux/pugixml