From 13e321c76a2257c1d2fffd2633c587abec8aeff1 Mon Sep 17 00:00:00 2001
From: Qing Zheng <zhengqmark@gmail.com>
Date: Mon, 21 Aug 2017 09:55:44 +0000
Subject: [PATCH] avoid empty env options

---
 scripts/common.sh.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/common.sh.in b/scripts/common.sh.in
index 359de99..8a64758 100644
--- a/scripts/common.sh.in
+++ b/scripts/common.sh.in
@@ -758,7 +758,7 @@ do_run() {
         env_vars=(
             "VPIC_current_working_dir" "${vpic_dir}"
             "LD_PRELOAD" "${dfsu_prefix}/lib/libdeltafs-preload.so"
-            "PRELOAD_Ignore_dirs" ${XX_IGNORE_DIRS:-""}
+            "PRELOAD_Ignore_dirs" ${XX_IGNORE_DIRS:-":"}
             "PRELOAD_Deltafs_root" "particle"
             "PRELOAD_Local_root" "${plfs_dir}"
             "PRELOAD_Log_home" "${exp_jobdir}/exp-info"