[FIX] event_sale, website_event_sale: treat edge case of 0 seats_max

When the max seats available is set to 0, there should not be a limit to
the seats available.

Previously this was not taken into account in the frontend event ticket
sale, so an event would appear to be sold out.

fixes #6999
opw-645542

addons/event_sale/event_sale.py

@@ -163,7 +163,10 @@ class event_event(osv.osv):
     @api.one
     @api.depends('event_ticket_ids.seats_max')
     def _compute_seats_max(self):
-        self.seats_max = sum(ticket.seats_max for ticket in self.event_ticket_ids)
+        if any(ticket.seats_max == 0 for ticket in self.event_ticket_ids):
+            self.seats_max = 0
+        else:
+            self.seats_max = sum(ticket.seats_max for ticket in self.event_ticket_ids)
 
 class event_ticket(osv.osv):
     _name = 'event.event.ticket'

addons/website_event_sale/views/website_event_sale.xml

@@ -11,7 +11,7 @@
 <template id="index" inherit_id="website_event.index" name="Event's Ticket">
     <xpath expr="//li[@t-foreach='event_ids']/div/h4" position="before">
         <t t-if="event.state in ['draft', 'confirm'] and event.event_ticket_ids">
-            <span t-if="not event.seats_available" class="label label-danger pull-right">Sold Out</span>
+            <span t-if="not event.seats_available and event.seats_max" class="label label-danger pull-right">Sold Out</span>
             <span t-if="event.seats_available and event.seats_available &lt;= ((event.seats_max or 0) / 4)" class="label pull-right label-info">
                 Only <t t-esc="event.seats_available"/> Remaining
             </span>
@@ -66,16 +66,16 @@
                             </span>
                         </td>
                         <td>
-                            <select t-if="ticket.seats_available" t-attf-name="ticket-#{ ticket.id }" class="form-control">
-                                <t t-foreach="range(0, ticket.seats_available > 9 and 10 or ticket.seats_available+1 )" t-as="nb"><option t-esc="nb"/></t>
+                            <select t-if="ticket.seats_available or not ticket.seats_max" t-attf-name="ticket-#{ ticket.id }" class="form-control">
+                                <t t-foreach="range(0, min((ticket.seats_available or 9) + 1, 10))" t-as="nb"><option t-esc="nb"/></t>
                             </select>
-                            <span t-if="not ticket.seats_available">Sold Out</span>
+                            <span t-if="not ticket.seats_available and ticket.seats_max">Sold Out</span>
                         </td>
                       </tr>
                     </t>
                 </tbody>
             </table>
-            <button type="submit" class="btn btn-primary btn-lg pull-right" t-if="event.seats_available">Order Now</button>
+            <button type="submit" class="btn btn-primary btn-lg pull-right" t-if="event.seats_available or not event.seats_max">Order Now</button>
             <div class="clearfix"/>
             <hr/>
         </form>