Paste #484880

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=== modified file 'charmhelpers/contrib/openstack/neutron.py'
--- charmhelpers/contrib/openstack/neutron.py	2016-01-22 23:48:29 +0000
+++ charmhelpers/contrib/openstack/neutron.py	2016-01-25 14:57:14 +0000
@@ -237,7 +237,8 @@
         plugins['midonet']['driver'] = (
             'neutron.plugins.midonet.plugin.MidonetPluginV2')
     if release >= 'liberty':
-        if config('midonet-origin')[4:5] == '1':
+        midonet_origin = config('midonet-origin')
+        if midonet_origin is not None and midonet_origin[4:5] == '1':
             plugins['midonet']['driver'] = (
                 'midonet.neutron.plugin_v1.MidonetPluginV2')
     return plugins