[library-web] add more debugging for combining documents

[Frederic Peters <fpeters src gnome org>]

commit 4a4724154192d6db336aeac6d9a4530e256eaa9c
Author: Frédéric Péters <fpeters 0d be>
Date:   Wed Jan 29 18:24:27 2014 +0000

    add more debugging for combining documents

 src/lgo.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/lgo.py b/src/lgo.py
index 4853a59..f8fbb60 100755
--- a/src/lgo.py
+++ b/src/lgo.py
@@ -722,6 +722,8 @@ class Lgo(App):
                         try:
                             gnome_help_doc.version_subs.get(doc.one_dot_version).extend_mallard(doc)
                         except AttributeError:
+                            logging.debug('failed combining documents (%s, %s)' % (
+                                    doc.one_dot_version, lang))
                             continue
                         logging.debug('extending gnome-help with gnome-getting-started-docs %s (%s)' % (
                                 doc.one_dot_version, lang))