better tls zone calculation

src/risotto/machine.py

@@ -296,7 +296,7 @@ class Loader:
                 zones_name = server_datas['zones_name']
                 values = [f'{server_name}.{self.zones[zone_name]["domain_name"]}' for zone_name in zones_name]
                 if server_datas['applicationservice'] == 'tls':
-                    true_host_name = f'{server_name}.{self.zones[list(self.zones)[0]]["domain_name"]}'
+                    true_host_name = f'{server_name}.{self.zones[server_datas["zones_name"][0]]["domain_name"]}'
                 else:
                     true_host_name = values[0]
                 cfg['risotto_globals'][true_host_name] = {'global:host_name': host_name,
@@ -334,7 +334,7 @@ class Loader:
     def add_tls(self):
         dns_module_name = None
         for host in self.servers_json['hosts'].values():
-            zones = [self.servers_json['zones']['external_zone']]
+            zones = [self.servers_json['zones']['external_zone'], None]
             for server_name, datas in host['servers'].items():
                 if not 'applicationservice' in datas:
                     raise Exception(f'cannot find applicationservice for "{server_name}"')
@@ -345,8 +345,8 @@ class Loader:
                     if dns_module_name:
                         break
                     zones[1] = datas['provider_zone']
-            if zones[0] == zones[1]:
-                zones = [zones[0]]
+            if zones[0] == zones[1] or not zones[1]:
+                zones.pop(1)
             host['servers']['tls'] = {'applicationservice': 'tls',
                                       'zones_name': zones,
                                       }