fix a bug in svgToString function: some elements have no attribute, so when convert it to stinrg some namespace can't be set correctly.
fix a bug in svgToString function:
some elements have no attribute, so when convert it to stinrg some namespace can't be set correctly.

now, the tag like this can be correctly converted:
<se:mytag>hello</se:mytag>

git-svn-id: e52e7dec99011c9686d89c3d3c01e7ff0d333eee@2517 eee81c28-f429-11dd-99c0-75d572ba1ddd

BakerSky/svgedit,ubbn/svgedit,beavis28/svgedit,beavis28/svgedit,ubbn/svgedit,mynext/svgedit,thewenneur/svgedit,centaurustech/svgedit,centaurustech/svgedit,beavis28/svgedit,SVG-Edit/svgedit,thewenneur/svgedit,progers/svgedit,laddhoffman/svgedit,uche40/svgedit,mynext/svgedit,mynext/svgedit,centaurustech/svgedit,mynext/svgedit,thewenneur/svgedit,laddhoffman/svgedit,tremez/svgedit,tremez/svgedit,thewenneur/svgedit,BakerSky/svgedit,laddhoffman/svgedit,progers/svgedit,ubbn/svgedit,laddhoffman/svgedit,tremez/svgedit,BakerSky/svgedit,uche40/svgedit,progers/svgedit,tremez/svgedit,beavis28/svgedit,bartuspan/svgedit,bartuspan/svgedit,uche40/svgedit,ubbn/svgedit,centaurustech/svgedit,bartuspan/svgedit,progers/svgedit,bartuspan/svgedit,SVG-Edit/svgedit,uche40/svgedit,SVG-Edit/svgedit,BakerSky/svgedit