make luisrecognizer only return topintent

libraries/Microsoft.Bot.Builder.AI.LUIS/LuisRecognizer.cs

@@ -288,7 +288,8 @@ namespace Microsoft.Bot.Builder.AI.Luis
             {
                 Text = utterance,
                 AlteredText = luisResult.AlteredQuery,
-                Intents = LuisUtil.GetIntents(luisResult),
+                //Intents = LuisUtil.GetIntents(luisResult), return only top intent
+                Intents = new Dictionary<string, IntentScore>() { { luisResult.TopScoringIntent.Intent, new IntentScore() { Score = luisResult.TopScoringIntent.Score } } },
                 Entities = LuisUtil.ExtractEntitiesAndMetadata(luisResult.Entities, luisResult.CompositeEntities, _options.IncludeInstanceData ?? true),
             };
             LuisUtil.AddProperties(luisResult, recognizerResult);

libraries/Microsoft.Bot.Builder/RecognizerResult.cs

@@ -38,7 +38,7 @@ namespace Microsoft.Bot.Builder
         /// Mapping from intent to information about the intent.
         /// </value>
         [JsonProperty("intents")]
-        public IDictionary<string, IntentScore> Intents { get; set; }
+        public IDictionary<string, IntentScore> Intents { get; set; } = new Dictionary<string, IntentScore>();
 
         /// <summary>
         /// Gets or sets the recognized top-level entities.
@@ -47,7 +47,7 @@ namespace Microsoft.Bot.Builder
         /// Object with each top-level recognized entity as a key.
         /// </value>
         [JsonProperty("entities")]
-        public JObject Entities { get; set; }
+        public JObject Entities { get; set; } = new JObject();
 
         /// <summary>
         /// Gets or sets properties that are not otherwise defined by the <see cref="RecognizerResult"/> type but that