Miguel Dantas f1717bde51 Fix 'Call to a member function getPayload() on null'
Trying to enable the RedisCache with the latest nightly, getting this with the daemon:

sep 25 11:40:18 friedrich startdaemons.sh[21428]: PHP Fatal error:  Uncaught Error: Call to a member function getPayload() on null in /var/www/social/plugins/RedisCache/RedisCachePlugin.php:96
sep 25 11:40:18 friedrich startdaemons.sh[21428]: Stack trace:
sep 25 11:40:18 friedrich startdaemons.sh[21428]: #0 /var/www/social/lib/util/event.php(89): RedisCachePlugin->onStartCacheSet('gnusocial:herds...', Object(HubSub), NULL, 86400, false)
sep 25 11:40:18 friedrich startdaemons.sh[21428]: #1 /var/www/social/lib/cache/cache.php(202): Event::handle('StartCacheSet', Array)
sep 25 11:40:18 friedrich startdaemons.sh[21428]: #2 /var/www/social/classes/Memcached_DataObject.php(520): Cache->set('gnusocial:herds...', Object(HubSub))
sep 25 11:40:18 friedrich startdaemons.sh[21428]: #3 /var/www/social/classes/Memcached_DataObject.php(52): Memcached_DataObject->encache()
sep 25 11:40:18 friedrich startdaemons.sh[21428]: #4 /var/www/social/classes/Managed_DataObject.php(50): Memcached_DataObject::getClassKV('HubSub', 'hashkey', 'a38b9dc516371af...')
sep 25 11:40:18 friedrich startdaemons.sh[21428]: #5 /var/www/social/plugins/OStatus/classes/HubSub.php(47): Managed_DataObject::getKV('hashkey', 'a38b9dc516371af...')
sep 25 11:40:18 friedrich startdaemons.sh[21428]: #6 /var/www/social/plugins/OStatus/lib/hubprepqueuehandler.php(68): HubSub::getByHashkey('https://herds.e...', 'https://raki.so...')
sep 25 11:40:18 friedrich startdaemons.sh[21428]: #7 /var/www/social/plugins/RedisQueue/classes/RedisQueueManager.php(58): HubPrepQueueHandl in /var/www/social/plugins/RedisCache/RedisCachePlugin.php on line 96
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Several example plugins are included in the plugins/ directory. You can enable a plugin with the following line in config.php:

    addPlugin('Example', array('param1' => 'value1',
                               'param2' => 'value2'));

This will look for and load files named 'ExamplePlugin.php' or 'Example/ExamplePlugin.php' either in the plugins/ directory (for plugins that ship with StatusNet) or in the local/ directory (for plugins you write yourself or that you get from somewhere else) or local/plugins/.

Plugins are documented in their own directories.

Additional information on using and developing plugins can be found at the following locations: