From 4f4b67e95336f6e9d2d5bcaa4b97d69465f95b25 Mon Sep 17 00:00:00 2001
From: Edward Betts <edward@4angle.com>
Date: Thu, 6 Dec 2018 11:09:03 +0000
Subject: [PATCH] List of links is empty until documents are selected.

---
 sourcing/view.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sourcing/view.py b/sourcing/view.py
index 350a099..a9f2f6e 100644
--- a/sourcing/view.py
+++ b/sourcing/view.py
@@ -320,8 +320,11 @@ def build_links():
         save_new_xanalink(doc1, doc2)
         return redirect(url_for(request.endpoint, doc1=hashid1, doc2=hashid2))
 
-    links = list({i for i in doc1.subjects} &
-                 {i for i in doc2.subjects})
+    if doc1 and doc2:
+        links = list({i for i in doc1.subjects} &
+                     {i for i in doc2.subjects})
+    else:
+        links = []
 
     return render_template('build_links.html',
                            iter_lines=iter_lines,