minor tweaks to token

booking.helper.inc

@@ -1651,13 +1651,19 @@ function _booking_readinggroup_email_listing($node) {
 		}
 	}
 
+	// Don't show an empty header row if there was no-one in the group
+	if (count($rows) < 1) {
+		return implode("\n", $rows);
+	}
+
+	// Use Drupal's table theming function to build the table if HTML email is enabled
 	if(variable_get('booking_enable_html_mail', 0) == 1) {
 		$table = theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => $attributes));
 		watchdog('booking_debug', "<pre>Reading group table\n@info</pre>", array('@info' => print_r($table, true)));
 		return $table;
 	}
 	else {
-		return "";
+		return implode("\n", $rows);
 	}
 }