Merge branch 'jk/rebase-i-submodule-conflict-only'

Giving "--continue" to a conflicted "rebase -i" session skipped a commit
that only results in changes to submodules.

By John Keeping
* jk/rebase-i-submodule-conflict-only:
rebase -i continue: don't skip commits that only change submodules

diff --cc git-rebase--interactive.sh
Simple merge