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<     "head_title" => (drupal_get_title() ? strip_tags(drupal_get_title()) ." | ". variable_get("site_name", "drupal") : variable_get("site_name", "drupal") ." | ". variable_get("site_slogan", "")),
---
>     "head_title" => (drupal_get_title() ? strip_tags(drupal_get_title()) ." | ". variable_get("site_name", "drupal") : (variable_get("site_slogan", "") ? variable_get("site_name", "drupal") ." | ". variable_get("site_slogan", "") : variable_get("site_name", "drupal"))),