From 9be286a9004ae60f8ea48bb0c8871d70223f082b Mon Sep 17 00:00:00 2001
From: Roger Braun <roger@rogerbraun.net>
Date: Wed, 1 Nov 2017 09:33:29 +0100
Subject: [PATCH] Handle empty terms / tags.

---
 lib/pleroma/web/ostatus/ostatus.ex          | 4 +++-
 test/fixtures/ostatus_incoming_post_tag.xml | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/web/ostatus/ostatus.ex b/lib/pleroma/web/ostatus/ostatus.ex
index 1e8b71357..308e206c5 100644
--- a/lib/pleroma/web/ostatus/ostatus.ex
+++ b/lib/pleroma/web/ostatus/ostatus.ex
@@ -169,7 +169,9 @@ defmodule Pleroma.Web.OStatus do
 
   def get_tags(entry) do
     :xmerl_xpath.string('//category', entry)
-    |> Enum.map(fn (category) -> string_from_xpath("/category/@term", category) |> String.downcase end)
+    |> Enum.map(fn (category) -> string_from_xpath("/category/@term", category) end)
+    |> Enum.filter(&(&1))
+    |> Enum.map(&String.downcase/1)
   end
 
   def maybe_update(doc, user) do
diff --git a/test/fixtures/ostatus_incoming_post_tag.xml b/test/fixtures/ostatus_incoming_post_tag.xml
index 5febb80d1..0f99c4126 100644
--- a/test/fixtures/ostatus_incoming_post_tag.xml
+++ b/test/fixtures/ostatus_incoming_post_tag.xml
@@ -43,6 +43,7 @@
  <title>New note by lambadalambda</title>
  <content type="html">Will it blend?</content>
  <category term="Nsfw"/>
+ <category term=""/>
  <link rel="alternate" type="text/html" href="https://social.heldscal.la/notice/1967725"/>
  <status_net notice_id="1967725"></status_net>
  <activity:verb>http://activitystrea.ms/schema/1.0/post</activity:verb>