Merge commit '849db0ad237692d6cd98f0b9db13c834b3b3d11a' into relax-release-tools-check

Fixes: kubernetes-csi#21

Author: pohly

release-tools/verify-subtree.sh

@@ -30,7 +30,7 @@ if [ ! "$DIR" ]; then
     exit 1
 fi
 
-REV=$(git log -n1 --format=format:%H --no-merges -- "$DIR")
+REV=$(git log -n1 --remove-empty --format=format:%H --no-merges -- "$DIR")
 if [ "$REV" ]; then
     echo "Directory '$DIR' contains non-upstream changes:"
     echo