avoid segmentation fault in scheduling csirs for sa

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_primitives.c

@@ -2054,11 +2054,15 @@ void nr_csirs_scheduling(int Mod_idP,
 
   for (int UE_id = UE_list->head; UE_id >= 0; UE_id = UE_list->next[UE_id]) {
 
+    NR_NZP_CSI_RS_Resource_t *nzpcsi;
+    int period, offset;
     NR_UE_sched_ctrl_t *sched_ctrl = &UE_info->UE_sched_ctrl[UE_id];
     NR_CellGroupConfig_t *CellGroup = UE_info->CellGroup[UE_id];
+
+    if (!CellGroup || !CellGroup->spCellConfig || !CellGroup->spCellConfig->spCellConfigDedicated ||
+	      !CellGroup->spCellConfig->spCellConfigDedicated->csi_MeasConfig) continue;
+
     NR_CSI_MeasConfig_t *csi_measconfig = CellGroup->spCellConfig->spCellConfigDedicated->csi_MeasConfig->choice.setup;
-    NR_NZP_CSI_RS_Resource_t *nzpcsi;
-    int period, offset;
 
     nfapi_nr_dl_tti_request_body_t *dl_req = &gNB_mac->DL_req[CC_id].dl_tti_request_body;
     NR_BWP_Downlink_t *bwp=CellGroup->spCellConfig->spCellConfigDedicated->downlinkBWP_ToAddModList->list.array[sched_ctrl->active_bwp->bwp_Id-1];