Merge branch 'jh/maint-submodule-status-in-void' into next

* jh/maint-submodule-status-in-void:
  submodule summary: do not fail before the first commit

git-submodule.sh

@@ -559,7 +559,8 @@ cmd_summary() {
 		test $# = 0 || shift
 	elif test -z "$1" -o "$1" = "HEAD"
 	then
-		return
+		# before the first commit: compare with an empty tree
+		head=$(git hash-object -w -t tree --stdin </dev/null)
 	else
 		head="HEAD"
 	fi