Allow shell support to work when set -u is set (#2418)

6cc9b317 · Adam J. Stewart · becker33 · 5eb7026d · 6cc9b317
Commit 6cc9b317 authored 8 years ago by Adam J. Stewart Committed by becker33 8 years ago
--- a/share/spack/setup-env.sh
+++ b/share/spack/setup-env.sh
@@ -58,7 +58,7 @@

 function spack {
    # Zsh does not do word splitting by default, this enables it for this function only
-    if [ -n "$ZSH_VERSION" ]; then
+    if [ -n "${ZSH_VERSION:-}" ]; then
        emulate -L sh
    fi