From a60169ea0987df41ee540eefbb77cf3ff53446bc Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 15 Jun 2016 16:57:48 +0100
Subject: [PATCH] Handle og props with not content

---
 synapse/rest/media/v1/preview_url_resource.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index 37dd1de899..fc72896e0c 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -252,7 +252,8 @@ class PreviewUrlResource(Resource):
 
         og = {}
         for tag in tree.xpath("//*/meta[starts-with(@property, 'og:')]"):
-            og[tag.attrib['property']] = tag.attrib['content']
+            if 'content' in tag.attrib:
+                og[tag.attrib['property']] = tag.attrib['content']
 
         # TODO: grab article: meta tags too, e.g.: