erp5: Make "config" macro parameter mandatory.

It's already always provided, and looks dangerous: it is mutated during
execution.

stack/erp5/buildout.cfg

@@ -272,7 +272,7 @@ extra-context =
 [template-erp5]
 < = download-base
 filename = instance-erp5.cfg.in
-md5sum = 96d3611ffc0f6a6664cc2e9824adacdd
+md5sum = fabf98dcb9e3d0fa8236397d69293528
 
 [template-neo]
 < = download-base

stack/erp5/instance-erp5.cfg.in

@@ -18,7 +18,7 @@ config =
 extra-config =
 config-use-ipv6 = {{ dumps(slapparameter_dict.get('use-ipv6', False)) }}
 
-{% macro request(name, software_type, config_key, config={}, ret={'url': True}) -%}
+{% macro request(name, software_type, config_key, config, ret={'url': True}) -%}
 {% do config.update(slapparameter_dict.get(config_key, {})) -%}
 {% set section = 'request-' ~ name -%}
 [{{ section }}]