Fix GetReasoner.

Author: Oceania2018

src/Infrastructure/BotSharp.Core/Routing/Reasoning/NaiveReasoner.cs

@@ -29,6 +29,8 @@ public class NaiveReasoner : IRoutingReasoner
     private readonly IServiceProvider _services;
     private readonly ILogger _logger;
 
+    public string Name => "Naive Reasoner";
+
     public NaiveReasoner(IServiceProvider services, ILogger<NaiveReasoner> logger)
     {
         _services = services;

src/Infrastructure/BotSharp.Core/Routing/RoutingService.InstructLoop.cs

@@ -97,14 +97,20 @@ public IRoutingReasoner GetReasoner(Agent router)
     {
         var rule = router.RoutingRules.FirstOrDefault(x => x.Type == RuleType.Reasoner);
 
+        if (rule == null)
+        {
+            _logger.LogError($"Can't find any reasoner");
+            return _services.GetServices<IRoutingReasoner>().First(x => x.Name == "Naive Reasoner");
+        }
+
         var reasoner = _services.GetServices<IRoutingReasoner>().
             FirstOrDefault(x => x.GetType().Name.EndsWith(rule.Field));
 
         if (reasoner == null)
         {
-            _logger.LogError($"Can't find specific planner named {rule.Field}");
+            _logger.LogError($"Can't find specific reasoner named {rule.Field}");
             // Default use NaiveReasoner
-            return _services.GetRequiredService<NaiveReasoner>();
+            return _services.GetServices<IRoutingReasoner>().First(x => x.Name == "Naive Reasoner");
         }
 
         return reasoner;