Let's manage errors if they happens on OpenGraph stuff

apps/rp/models.py

@@ -185,7 +185,12 @@ class Article(VoteMixin):
             article.upvote(by)
 
         # Let's get metadata import
-        article.metadata = og.OpenGraph(url=url)
+        try:
+            metadata = og.OpenGraph(url=url.decode())
+            article.metadata = metadata.to_json()
+        except Exception:
+            # There's nothing behind the URL, so no metadata for us
+            pass
         article.save()
         return article
 

requirements.txt

@@ -15,5 +15,5 @@ url
 coreapi
 pygments
 markdown
-opengraph-py3
+opengraph_py3
 -e git+https://github.com/mariocesar/sorl-thumbnail.git#egg=sorl-thumbnail