fix source update_mirror

update_mirror.sh

@@ -10,9 +10,13 @@ set -e
 
 #Include all user options and dependencies
 git_mirrors_dir="${0%/*}"
-. "${git_mirrors_dir}/config.sh"
+[ -f "${git_mirrors_dir}/config.sh" ] && . "${git_mirrors_dir}/config.sh"
 . "${git_mirrors_dir}/lib/VERSION"
 . "${git_mirrors_dir}/lib/functions.sh"
+if [ ! -f "${git_mirrors_dir}/config.sh" ];then
+  red_echo "config.sh missing!  Copy and customize from config.sh.SAMPLE.  Aborting." 1>&2
+  exit 1
+fi
 
 cd "${git_mirrors_dir}"