Prevent remove_soft_breaks to remove tail text

Created originally on Bitbucket by agix (agix NA)

Was already merged in Bitbucket before import, marked as merged by the import user

I tried tox but I don't know it and I think I don't have the env for 3.4 testing.

Anyway, it should fix the issue https://bitbucket.org/faide/py3o.template/issues/6/text-following-soft_breaks-disappears