MDL-50923 themes: content-only class added before region-only

lib/outputrenderers.php

@@ -3760,14 +3760,14 @@ EOD;
                 $additionalclasses[] = 'docked-region-'.$region;
             }
         }
-        if (count($usedregions) === 1) {
+        if (!$usedregions) {
+            // No regions means there is only content, add 'content-only' class.
+            $additionalclasses[] = 'content-only';
+        } else if (count($usedregions) === 1) {
             // Add the -only class for the only used region.
             $region = array_shift($usedregions);
             $additionalclasses[] = $region . '-only';
         }
-        if (!$usedregions) {
-            $additionalclasses[] = 'content-only';
-        }
         foreach ($this->page->layout_options as $option => $value) {
             if ($value) {
                 $additionalclasses[] = 'layout-option-'.$option;