fix #1481

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17291 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
fix #1477

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@17292 29f149b2-0c63-11e1-8f5c-a347f6a9acd0