Cope with deleted addons

gistfile1.txt

Index: maintenance.py
===================================================================
--- maintenance.py	(revision 87210)
+++ maintenance.py	(working copy)
@@ -61,6 +61,7 @@
             REPLACE INTO stats_share_counts_totals (addon_id, service, count)
                 (SELECT addon_id, service, SUM(count)
                  FROM stats_share_counts
+                 RIGHT JOIN addons ON addon_id = addons.id
                  WHERE service IN (%s)
                  GROUP BY addon_id, service)""" %
                  ','.join('"%s"' % x for x in LINK_SHARING_SERVICES))