From 5bf5375f1c1cc8917339275f3cbafa5934781ac1 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 25 Feb 2016 08:31:49 +0530
Subject: [PATCH] ...

---
 src/calibre/ebooks/metadata/fb2.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/ebooks/metadata/fb2.py b/src/calibre/ebooks/metadata/fb2.py
index 7fd2de3d6e..3a071d926f 100644
--- a/src/calibre/ebooks/metadata/fb2.py
+++ b/src/calibre/ebooks/metadata/fb2.py
@@ -87,7 +87,7 @@ def get_metadata(stream):
     root = _get_fbroot(stream)
     ctx = Context(root)
     book_title = _parse_book_title(root, ctx)
-    authors = _parse_authors(root, ctx)
+    authors = _parse_authors(root, ctx) or [_('Unknown')]
 
     # fallback for book_title
     if book_title: