use external url instead of local checkout to get revision #

git-svn-id: http://svn.vuze.com/public/client/trunk@40635 c2c1b7af-1477-405b-86ee-8aefd1fc4dd2
Piece Map wasn't showing when there were no rows in Pieces View

git-svn-id: http://svn.vuze.com/public/client/trunk@40636 c2c1b7af-1477-405b-86ee-8aefd1fc4dd2