improve xml error output in repository generation
improve xml error output in repository generation

Change-Id: I968ad2a4ed5d26ed87afefc4008ccb67fc1d43e7
Reviewed-on: http://codereview.qt-project.org/6081
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Karsten Heimrich <81d67632fe4bf9afb88a400b41aa25e19a1d2a12@nokia.com>
Reviewed-by: Tim Jenssen <6a21f175c697b4129e1bafb6e9b52078bb1a6738@nokia.com>

olear/qtifw,olear/qtifw,olear/qtifw,olear/qtifw