From bf39410402486a427642aea8e939c0c1f2aa31fd Mon Sep 17 00:00:00 2001
From: Go MAEDA <maeda@farend.jp>
Date: Sun, 5 May 2019 01:37:57 +0000
Subject: [PATCH] Merged r18126 from trunk to 3.4-stable (#31125).

git-svn-id: http://svn.redmine.org/redmine/branches/3.4-stable@18128 e93f8b46-1217-0410-a6f0-8f06a7374b81
---
 lib/redmine/thumbnail.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/redmine/thumbnail.rb b/lib/redmine/thumbnail.rb
index 5779551da..e4ae768fe 100644
--- a/lib/redmine/thumbnail.rb
+++ b/lib/redmine/thumbnail.rb
@@ -49,7 +49,12 @@ module Redmine
 
     def self.convert_available?
       return @convert_available if defined?(@convert_available)
-      @convert_available = system("#{shell_quote CONVERT_BIN} -version") rescue false
+      begin
+        `#{shell_quote CONVERT_BIN} -version`
+        @convert_available = $?.success?
+      rescue
+        @convert_available = false
+      end
       logger.warn("Imagemagick's convert binary (#{CONVERT_BIN}) not available") unless @convert_available
       @convert_available
     end