blank lines in svn:ignore result in "/" lines in .gitignore

Subversion ignores blank lines in svn:ignore property values, but reposurgeon does not, instead turning them into lines containing a single slash.

For example:

foo.txt

bar.txt

becomes

# The contents of the svn:ignoreproperty on the branch root.
/
/foo.txt
/
/bar.txt
/
/

reposurgeon should interpret these properties the same way as subversion and git svn do.

I will try to come up with a patch and test case for this one, as some parts of our older repositories seem to have a lot of this going on.