Hello, Angelo
I have to correct my previous answer: if the branch you mention in "excludeBranch"
hasn't present before in SVN or in Git, then the 'rebuild' option is not needed, run
subgit install <GIT_REPO>
Sorry for that I didn't mention it yesterday.
Also, I'd like to add that there is a way to use Git-only branches without even touching mapping:
you can place git-only branches to a separate namespace in git, that isn't present in mapping
and those branches will become git-only. For example, create a branch in a 'gitonly' namespace:
git checkout -b gitonly/<branch name>
Thus new branches will be in 'gitonly' that isn't being translated to SVN.
Hope it will help.