From d7ceb38b060d1dcf41cf9537da5d20e9c4e7a451 Mon Sep 17 00:00:00 2001
From: Henrik Nyh <henrik@nyh.se>
Date: Sat, 8 Apr 2017 09:37:47 +0100
Subject: [PATCH] Avoid bash error when no version is set

Running "asdf current ruby" before installing any Rubies gave me:

    /Users/henrik/.asdf/lib/utils.sh: line 73: [: !=: unary operator expected
    No version set for ruby
---
 lib/utils.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/utils.sh b/lib/utils.sh
index c2e2d608..d6299822 100644
--- a/lib/utils.sh
+++ b/lib/utils.sh
@@ -68,7 +68,7 @@ check_if_version_exists() {
 
   check_if_plugin_exists $plugin_name
 
-  if [ $version != "system" ] && [ ! -d $version_dir ]; then
+  if [ "$version" != "system" ] && [ ! -d $version_dir ]; then
     display_error "version $version is not installed for $plugin_name"
     exit 1
   fi