From aacfe7e9c0f7cb2f9b618d2dfa68ec381a53fc3a Mon Sep 17 00:00:00 2001
From: Giuseppe De Marco <giuseppe.demarco@unical.it>
Date: Tue, 19 May 2020 19:03:22 +0200
Subject: [PATCH] Update filesig.py

---
 filesig/filesig.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/filesig/filesig.py b/filesig/filesig.py
index d581b31..34171ac 100644
--- a/filesig/filesig.py
+++ b/filesig/filesig.py
@@ -15,7 +15,7 @@
                                stdout = subprocess.PIPE,
                                stderr = subprocess.PIPE)
 stdout, stderr = proc_pdfsig.communicate()
-if stderr:
+if stdout:
     print(stdout.decode())
     print(stderr.decode())
     raise Exception(('pdfsig is not installed.'