bugfix; no more 500 when an order includes an hotel ticket
bugfix; no more 500 when an order includes an hotel ticket

leriomaggio/pycon_site,pythonitalia/pycon_site,pythonitalia/pycon_site,pythonitalia/pycon_site,leriomaggio/pycon_site,leriomaggio/pycon_site,leriomaggio/pycon_site,pythonitalia/pycon_site,leriomaggio/pycon_site,pythonitalia/pycon_site