Nullable refernce types refactoring

WotBlitzStatisticsPro.Logic/Dictionaries/VehiclesDictionaryUpdater.cs

@@ -21,7 +21,9 @@ namespace WotBlitzStatisticsPro.Logic.Dictionaries
         [Obsolete("Parameter-less constructor only for unit tests")]
         public VehiclesDictionaryUpdater()
         {
-
+            _wargamingDictionariesApiClient = null!;
+            _dataAccessor = null!;
+            _mapper = null!;
         }
 
         public VehiclesDictionaryUpdater(IWargamingDictionariesApiClient wargamingDictionariesApiClient,
@@ -57,6 +59,11 @@ namespace WotBlitzStatisticsPro.Logic.Dictionaries
                 var wgVehicles =
                     await _wargamingDictionariesApiClient.GetVehicles(defaultRealmType, requestLanguage);
 
+                if (wgVehicles == null)
+                {
+                    continue;
+                }
+
                 foreach (var wgVehicle in wgVehicles)
                 {
                     var mappedVehicle = vehicles.FirstOrDefault(v => v.TankId == wgVehicle.TankId);