manager: error when an alias zone is synced without its source

Signed-off-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>

octodns/manager.py

@@ -375,12 +375,19 @@ class Manager(object):
         futures = []
         for zone_name, zone_source in aliased_zones.items():
             source_config = self.config['zones'][zone_source]
+            print(source_config)
+            try:
+                desired_config = desired[zone_source]
+            except KeyError:
+                raise ManagerException('Zone {} cannot be sync without zone '
+                                       '{} sinced it is aliased'
+                                       .format(zone_name, zone_source))
             futures.append(self._executor.submit(
                 self._populate_and_plan,
                 zone_name,
                 [],
                 [self.providers[t] for t in source_config['targets']],
-                desired=desired[zone_source],
+                desired=desired_config,
                 lenient=lenient
             ))