bugfix: avoids errors when some ohai attributes are not set
bugfix: avoids errors when some ohai attributes are not set

easybiblabs/chef-handler-sns,zuazo/chef-handler-sns,zuazo/chef-handler-sns,onddo/chef-handler-sns,mevic/chef-handler-sns,mixpanel-platform/chef-handler-sns,mixpanel-platform/chef-handler-sns,onddo/chef-handler-sns,mevic/chef-handler-sns