From 1df1e80302ad4136e27a92344265101de5fc2c87 Mon Sep 17 00:00:00 2001
From: Nicolas Riesco <enquiries@nicolasriesco.net>
Date: Sat, 18 Jun 2016 17:51:15 +0100
Subject: [PATCH] handlers: do not send empty results on IOPub

---
 lib/handlers_v4.js | 4 ++++
 lib/handlers_v5.js | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/lib/handlers_v4.js b/lib/handlers_v4.js
index fde452e..c9d1294 100755
--- a/lib/handlers_v4.js
+++ b/lib/handlers_v4.js
@@ -165,6 +165,10 @@ function execute_request(request) {
             }
         );
 
+        if (!result.mime) {
+            return;
+        }
+
         if (this.hideUndefined &&
             result.mime["text/plain"] === "undefined") {
             return;
diff --git a/lib/handlers_v5.js b/lib/handlers_v5.js
index a76661d..49dc486 100755
--- a/lib/handlers_v5.js
+++ b/lib/handlers_v5.js
@@ -185,6 +185,10 @@ function execute_request(request) {
             }
         );
 
+        if (!result.mime) {
+            return;
+        }
+
         if (this.hideUndefined &&
             result.mime["text/plain"] === "undefined") {
             return;