[dak/master] generate-d-i: Use "set -u"

[Ansgar Burchardt <ansgar@debian.org>]

---
 scripts/debian/generate-d-i |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/debian/generate-d-i b/scripts/debian/generate-d-i
index 391e830..d5deea4 100755
--- a/scripts/debian/generate-d-i
+++ b/scripts/debian/generate-d-i
@@ -3,6 +3,8 @@
 # Original written from Jeroen van Wolffelaar <jeroen@debian.org>
 
 set -e
+set -u
+
 export SCRIPTVARS=/srv/ftp-master.debian.org/dak/config/debian/vars
 . $SCRIPTVARS
 
-- 
1.7.10.4