SUBDIRECTORY_OK='Yes'
. git-sh-setup
-diff_tree_flags=$(git-rev-parse --sq --no-revs --flags "$@")
+diff_tree_flags=$(git-rev-parse --sq --no-revs --flags "$@") || exit
test -z "$diff_tree_flags" &&
diff_tree_flags=$(git-repo-config --get whatchanged.difftree)
test -z "$diff_tree_flags" &&