diff format documentation: describe raw combined diff format

diff --git a/git-applymbox.sh b/git-applymbox.sh
index 1f68599ae51a671f8c7a3a01c6aa9c6b205dd217..c18e80ff8cd5a66a64e22cf96e77fad519d33b5d 100755 (executable)
--- a/git-applymbox.sh
+++ b/git-applymbox.sh
@@ -77,6 +77,10 @@ do
     *)
            git-mailinfo $keep_subject $utf8 \
                .dotest/msg .dotest/patch <$i >.dotest/info || exit 1
+           test -s .dotest/patch || {
+               echo "Patch is empty.  Was it split wrong?"
+               exit 1
+           }
            git-stripspace < .dotest/msg > .dotest/msg-clean
            ;;
     esac