Sourav Paul
--- a/core/modules/block/block.module
+++ b/core/modules/block/block.module
      $output .= '<dd>' . t('You can add content blocks, if the <em>Block Content</em> module is installed. For more information, see the <a href=":blockcontent-help">Block Content help page</a>.', [':blockcontent-help' => $block_content]) . '</dd>';
      $output .= '</dl>';
      return $output;
+
+    default:
+      return '';