BF: move -u in nd_build down so we get sensible help

diff --git a/tools/nd_backport b/tools/nd_backport
index b71fe5d6ba0b3f9b23cf5f89ccfb47603e3dea12..b91b54a3d54e60780ed9b73de1b3286e71256d4f 100755 (executable)
--- a/tools/nd_backport
+++ b/tools/nd_backport
@@ -4,7 +4,6 @@
 #
 
 set -e
-set -u
 
 release=$1
 dscfile=$2
@@ -27,6 +26,8 @@ EOT
 exit 1
 fi
 
+set -u
+
 upstream_name=${dscfile%%_*}
 
 # To overcome bash desire to claim empty array unbound under 'set -u'