[evince] pdf: Fix critical warning for links with NULL action

[Christian Persch <chpe src gnome org>]

commit 2254c086ee8d6e735d272df32f555492e623f208
Author: Christian Persch <chpe gnome org>
Date:   Sun Jun 9 00:06:46 2013 +0200

    pdf: Fix critical warning for links with NULL action

 backend/pdf/ev-poppler.cc |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/backend/pdf/ev-poppler.cc b/backend/pdf/ev-poppler.cc
index 883de2d..c3a983a 100644
--- a/backend/pdf/ev-poppler.cc
+++ b/backend/pdf/ev-poppler.cc
@@ -1405,7 +1405,8 @@ ev_link_from_action (PdfDocument   *pdf_document,
        }
        
        link = ev_link_new (action->any.title, ev_action);
-       g_object_unref (ev_action);
+       if (ev_action)
+               g_object_unref (ev_action);
 
        return link;    
 }