fix #9433 - NoSuchElementException in validator at upload (probably after purge of all elements of a given error)

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6475 0c6e7542-c601-0410-84e7-c038aed88b3b
fix #9425 - render closed ways as such in relation editor

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6476 0c6e7542-c601-0410-84e7-c038aed88b3b
fix #9421 - presets: add optional `ref` to residential highway

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6477 0c6e7542-c601-0410-84e7-c038aed88b3b