Fix the Debian packaging script on systems with no codename

When calling `make deb-pkg` on a system with no codename (for example
Arch Linux), lsb_release sometimes outputs `n/a` as the codename.

This breaks dpkg-parsechangelog, which can't process the changelog
correctly.

Signed-off-by: Marcin Mielniczuk <marmistrz.dev@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.com>
diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index 116ef00..510add6 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -240,7 +240,8 @@
 # Try to determine distribution
 if [ -n "$KDEB_CHANGELOG_DIST" ]; then
         distribution=$KDEB_CHANGELOG_DIST
-elif distribution=$(lsb_release -cs 2>/dev/null) && [ -n "$distribution" ]; then
+# In some cases lsb_release returns the codename as n/a, which breaks dpkg-parsechangelog
+elif distribution=$(lsb_release -cs 2>/dev/null) && [ -n "$distribution" ] && [ "$distribution" != "n/a" ]; then
         : # nothing to do in this case
 else
         distribution="unstable"