Merge pull request #383 from Kitzanos/ndg-null-check-prod

Cherry-pick ( Applied null checks in NDG flow)

src/main/java/net/gepafin/tendermanagement/dao/AppointmentDao.java

@@ -560,10 +560,12 @@ public class AppointmentDao {
             }else {
                 ndgResponse = retrieveNdgByVatNumber(company.getVatNumber(), authorizationToken, hub, application,company);
             }
+            if(ndgResponse!=null) {
                 if (isNdgValid(ndgResponse.getNdg())) {
                     saveNdg(application, company, ndgResponse.getNdg());
                     log.info("NDG successfully generated for applicationId: {}", applicationId);
-            } else {
+                }
+            }else {
                 log.info("Polling for NDG for applicationId: {}", applicationId);
                 handleNdgPolling(application, company, hub, authorizationToken);
             }
@@ -743,6 +745,9 @@ public class AppointmentDao {
             String responseJson = getNdgFromExternalService(vatNumber, authorizationToken);
             // Parse and return the NDG response
             AppointmentLoginResponse loginResponse=parseNdgResponse(responseJson);
+            if(loginResponse==null){
+                return null;
+            }
             ObjectMapper objectMapper = new ObjectMapper();
             JsonNode rootNode = null;
             try {