call loads for parameter_dict['zodb-list'] that is a JSON string here.

software/erp5/zope.conf.in

@@ -87,7 +87,7 @@ parameter with timerserver interval, empty string meaning disabled -#}
   container-class Products.TemporaryFolder.TemporaryContainer
 </zodb_db>
 
-{% for db_name, mount_point, cache_size, storage_type, storage_dict in parameter_dict['zodb-list'] -%}
+{% for db_name, mount_point, cache_size, storage_type, storage_dict in json_module.loads(parameter_dict['zodb-list']) -%}
 <zodb_db {{ db_name }}>
 {%-   if cache_size %}
   cache-size {{ cache_size }}