Fix for node edit error
When using the CLF theme to edit a node and not using the admin theme I received the following error:
  Fatal error: [] operator not supported for strings in /var/www/virtualhosts/dev-www.microbiology.ubc.ca/includes/theme.inc on line 1909
I tracked it down to the class attributes not being set as an array.  See similar issue here: https://drupal.org/node/1237020