Fix atom item with multiple authors not getting converted to string

lib/parser/atom.ex

@@ -73,8 +73,7 @@ defmodule FeedParser.Parser.Atom do
           end
 
         author =
-          texts('/entry/author/name/text()', entry) ||
+          (texts('/entry/author/name/text()', entry) || feed_author)
-            feed_author
           |> case do
             nil -> nil
             authors -> Enum.join(authors, ", ")

test/fixtures/atom/multi_author_item.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+
+  <title>Example Feed</title>
+  <link href="http://example.org/"/>
+  <updated>2003-12-13T18:30:02Z</updated>
+  <id>urn:uuid:60a76c80-d399-11d9-b93C-0003939e0af6</id>
+
+  <entry>
+    <title>Atom-Powered Robots Run Amok</title>
+    <link href="http://example.org/2003/12/13/atom03"/>
+    <id>urn:uuid:1225c695-cfb8-4ebb-aaaa-80da344efa6a</id>
+    <updated>2003-12-13T18:30:02Z</updated>
+    <summary>Some text.</summary>
+    <author>
+      <name>John Doe</name>
+    </author>
+	  <author>
+      <name>Jane Doe</name>
+    </author>
+  </entry>
+
+</feed>

test/parser/atom_test.exs

@@ -48,4 +48,11 @@ defmodule FeedParser.Parser.AtomTest do
     assert {:ok, %FeedParser.Feed{items: items}} = Atom.parse_feed(parsed_data)
     assert [%FeedParser.Item{creator: "John Doe, Jane Doe"}] = items
   end
+
+  test "parses ato item with multiple authors" do
+    data = File.read!("test/fixtures/atom/multi_author_item.xml")
+    {true, parsed_data} = Atom.accepts(data, "application/atom+xml")
+    assert {:ok, %FeedParser.Feed{items: items}} = Atom.parse_feed(parsed_data)
+    assert [%FeedParser.Item{creator: "John Doe, Jane Doe"}] = items
+  end
 end