radiology API fixes

lib/core/service/medical/radiology_service.dart

@@ -28,7 +28,7 @@ class RadiologyService extends BaseService {
     await baseAppClient.post(GET_PATIENT_ORDERS, onSuccess: (dynamic response, int statusCode) {
       finalRadiologyList.clear();
       // response['FinalRadiologyList'].forEach((radiology) {
-      if (response['FinalRadiologyList'].length != 0) {
+      if (response['FinalRadiologyList'] != null && response['FinalRadiologyList'].length != 0) {
         response['FinalRadiologyList'].forEach((radiology) {
           finalRadiologyList.add(FinalRadiology.fromJson(radiology));
         });