Fix get online agentnames

src/Managing.Application/ManageBot/GetOnlineAgentNamesCommandHandler.cs

@@ -7,7 +7,7 @@ namespace Managing.Application.ManageBot
     /// <summary>
     /// Handler for retrieving only online agent names
     /// </summary>
-    public class GetOnlineAgentNamesCommandHandler : IRequestHandler<GetOnlineAgentNamesCommand, IEnumerable<string>>
+    public class GetOnlineAgentNamesCommandHandler : IRequestHandler<GetOnlineAgentNamesCommand, List<string>>
     {
         private readonly IBotService _botService;
 
@@ -16,10 +16,11 @@ namespace Managing.Application.ManageBot
             _botService = botService;
         }
 
-        public async Task<IEnumerable<string>> Handle(GetOnlineAgentNamesCommand request,
+        public async Task<List<string>> Handle(GetOnlineAgentNamesCommand request,
             CancellationToken cancellationToken)
         {
-            return await _botService.GetActiveBotsNamesAsync();
+            var activeBots = await _botService.GetActiveBotsNamesAsync();
+            return activeBots.ToList();
         }
     }
 }