# HG changeset patch
# User Brian Neal <bgneal@gmail.com>
# Date 1444094774 18000
# Node ID a828e80223d238b5fcd3913bf8cb8411d584fdda
# Parent  ba0f4a5f1fca145909a83beb0fc1bb293d10f6ac
Prevent 500 error when previewing no text.

Don't call image_check() when there is no data.

diff -r ba0f4a5f1fca -r a828e80223d2 comments/views.py
--- a/comments/views.py	Mon Oct 05 20:20:34 2015 -0500
+++ b/comments/views.py	Mon Oct 05 20:26:14 2015 -0500
@@ -145,10 +145,11 @@
         return HttpResponseBadRequest('No data')
 
     html = site_markup(data)
-    try:
-        image_check(html)
-    except ImageCheckError as ex:
-        html = PREVIEW_UNAVAILABLE.format(ex)
+    if html:
+        try:
+            image_check(html)
+        except ImageCheckError as ex:
+            html = PREVIEW_UNAVAILABLE.format(ex)
 
     return render_to_response('comments/markdown_preview.html', {
         'data': html,