DU only node YAML configuration: typo in gnb_config.c

--- a/openair2/GNB_APP/gnb_config.c
+++ b/openair2/GNB_APP/gnb_config.c
@@ -832,7 +832,7 @@ void RCconfig_verify(configmodule_interface_t *cfg, ngran_node_t node_type)
     verify_gnb_param_notset(gnbp, GNB_ENABLE_SDAP_IDX, GNB_CONFIG_STRING_ENABLE_SDAP);
     verify_gnb_param_notset(gnbp, GNB_DRBS, GNB_CONFIG_STRING_DRBS);

-    verify_section_notset(cfg, GNB_CONFIG_STRING_GNB_LIST ".", GNB_CONFIG_STRING_AMF_IP_ADDRESS);
+    verify_section_notset(cfg, GNB_CONFIG_STRING_GNB_LIST ".[0]", GNB_CONFIG_STRING_AMF_IP_ADDRESS);
     verify_section_notset(cfg, NULL, CONFIG_STRING_SECURITY);
   } // else nothing to be checked

Original code throws exception:

terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::at: __n (which is 0) >= this->size() (which is 0)
Aborted