fix #9133 - avoid blank icons for nodes with `maxstay` or `toll` keys

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6273 0c6e7542-c601-0410-84e7-c038aed88b3b
see #9133 - woops, didn't want to change this one

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6274 0c6e7542-c601-0410-84e7-c038aed88b3b
fix #9129 - unnecessary change command when merning two nodes with exact same coordinates

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6275 0c6e7542-c601-0410-84e7-c038aed88b3b