Sends report twice to slack

[nirbhabbarat]

Running handlers:
[2015-05-19T02:05:47+00:00] ERROR: Running exception handlers
[2015-05-19T02:05:47+00:00] WARN: Sending report to Slack webhook https://hooks.slack.com/services/XXXX/XXXX/XXXXXXXXXXXXXXXX
[2015-05-19T02:05:47+00:00] WARN: Sending report to Slack webhook https://hooks.slack.com/services/XXXX/XXXX/XXXXXXXXXXXXXXXX

• Chef::Handler::Slack
  Running handlers complete
  [2015-05-19T02:05:47+00:00] ERROR: Exception handlers complete
  [2015-05-19T02:05:47+00:00] FATAL: Stacktrace dumped to /var/chef/cache/chef-stacktrace.out
  Chef Client failed. 3 resources updated in 10.692194779 seconds
  [2015-05-19T02:05:48+00:00] ERROR: template[/etc/haproxy/conf.d/default.cfg](haproxy::default line 26) had an error: Chef::Exceptions::FileNotFound: Cookbook 'haproxy' (0.1.0) does not contain a file at any of these locations:
  templates/centos-6.6/defaults.erb
  templates/centos/defaults.erb
  templates/default/defaults.erb
  templates/defaults.erb

haproxy is intentionally broken to test, please ignore that!

[nirbhabbarat]

Not a bug,

This happened cause of both enabled, dumb mistake
default_unless['chef_client']['handler']['slack']['webhooks']['name'] = ['monitoring']
default['chef_client']['handler']['slack']['webhooks']['name'].push('monitoring')