scaleway: initialise auth_token to none (#43183)

Fixes: #43132

contrib/inventory/scaleway.py

@@ -152,6 +152,7 @@ def generate_inv_from_api(config):
     try:
         inventory['scaleway'] = copy.deepcopy(EMPTY_GROUP)
 
+        auth_token = None
         if config.has_option('auth', 'api_token'):
             auth_token = config.get('auth', 'api_token')
         auth_token = env_or_param('SCALEWAY_TOKEN', param=auth_token)