[library-web] dont't fail extending a missing document

[Frederic Peters <fpeters src gnome org>]

commit c460f0a778bc5531eb4acddd7554830b65ef81f3
Author: Frédéric Péters <fpeters 0d be>
Date:   Wed Jan 29 17:37:37 2014 +0000

    dont't fail extending a missing document

 src/lgo.py |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/lgo.py b/src/lgo.py
index c6f3603..23c42ab 100755
--- a/src/lgo.py
+++ b/src/lgo.py
@@ -719,7 +719,10 @@ class Lgo(App):
                     except IndexError:
                         pass
                     else:
-                        gnome_help_doc.version_subs.get(doc.one_dot_version).extend_mallard(doc)
+                        try:
+                            gnome_help_doc.version_subs.get(doc.one_dot_version).extend_mallard(doc)
+                        except AttributeError:
+                            continue
                         doc.filename = filename
                         doc.mtime_tarball = mtime
                         if extraction_happened: