Default to 16.04 config if none specified

config

@@ -1,13 +1,13 @@
 #!/bin/bash
 
 if [ -z "$BUILD_CONFIG" ] ; then
-    echo "Set BUILD_CONFIG first"
-    false
-else
-    echo "Loading config file: config-$BUILD_CONFIG"
-    . config-$BUILD_CONFIG
+    export BUILD_CONFIG=16.04
+    echo "No BUILD_CONFIG set -- assuming $BUILD_CONFIG"
+fi
+
+echo "Loading config file: config-$BUILD_CONFIG"
+. config-$BUILD_CONFIG
 #    echo " Ubuntu version: ${VERSION}"
 #    echo "      Input ISO: ${ISONAME}"
 #    echo "           from: ${ORIGURL}"
 #    echo "     Output ISO: ${OUTPUT}"
-fi