start work on admin page for early access codes

booking.reports.inc

@@ -718,6 +718,7 @@ function booking_csv_report() {
 	$nullToMysqlNull = true;
   $delimiter_esc = preg_quote($delimiter, '/');
   $enclosure_esc = preg_quote($enclosure, '/');	
+	$readinggroup_id = "";
 	
 	//$readinggroup = "session" . variable_get('booking_readinggroup_id','7');