From 85d8db21d2e7617ade950e9cd4da64ec887671d4 Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@palantir.com>
Date: Tue, 27 Feb 2018 15:55:03 -0800
Subject: [PATCH] Always include something in ErrorStack's Display

The error stack can be empty after a some kinds of errors (AEAD
validation failure in Crypter is one example), and we don't want to
display as an empty string in that case.
---
 openssl/src/error.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/openssl/src/error.rs b/openssl/src/error.rs
index 7f3d472e..1ddd0f50 100644
--- a/openssl/src/error.rs
+++ b/openssl/src/error.rs
@@ -59,6 +59,10 @@ impl ErrorStack {
 
 impl fmt::Display for ErrorStack {
     fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        if self.0.is_empty() {
+            return fmt.write_str("OpenSSL error");
+        }
+
         let mut first = true;
         for err in &self.0 {
             if !first {