[josm_opendata] fix EDT violation

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29665 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_opendata] fix #josm8805 - invalid read of csv files with comma as separator

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29666 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4