null guard and fix ctor

Libraries/Core/Controllers/RepairController.cs

@@ -40,7 +40,7 @@ public class RepairController(
                 body.TId,
                 output);
 
-            if (output.Warnings.Count > 0)
+            if (output.Warnings?.Count > 0)
             {
                 return output;
             }

Libraries/Core/Services/RepairService.cs

@@ -20,7 +20,7 @@ namespace Core.Services;
 [Injectable(InjectionType.Singleton)]
 public class RepairService(
     ISptLogger<RepairService> _logger,
-    RandomUtil randomUtil,
+    RandomUtil _randomUtil,
     DatabaseService _databaseService,
     ItemHelper _itemHelper,
     TraderHelper _traderHelper,
@@ -31,10 +31,7 @@ public class RepairService(
     ConfigServer _configServer,
     WeightedRandomHelper _weightedRandomHelper)
 {
-    private readonly ISptLogger<RepairService> _logger;
-    private readonly RandomUtil _randomUtil;
-    private readonly WeightedRandomHelper _weightedRandomHelper;
-    private readonly RepairConfig _repairConfig = _configServer.GetConfig<RepairConfig>();
+    protected RepairConfig _repairConfig = _configServer.GetConfig<RepairConfig>();
 
 
     /// <summary>