fix new error when entering an empty command in SMAPI console

src/StardewModdingAPI/Framework/CommandManager.cs

@@ -70,6 +70,9 @@ namespace StardewModdingAPI.Framework
         /// <returns>Returns whether a matching command was triggered.</returns>
         public bool Trigger(string input)
         {
+            if (string.IsNullOrWhiteSpace(input))
+                return false;
+
             string[] args = input.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
             string name = args[0];
             args = args.Skip(1).ToArray();

src/StardewModdingAPI/Program.cs

@@ -575,7 +575,7 @@ namespace StardewModdingAPI
             while (true)
             {
                 string input = Console.ReadLine();
-                if (!this.CommandManager.Trigger(input))
+                if (!string.IsNullOrWhiteSpace(input) && !this.CommandManager.Trigger(input))
                     this.Monitor.Log("Unknown command; type 'help' for a list of available commands.", LogLevel.Error);
             }
         }
@@ -587,7 +587,6 @@ namespace StardewModdingAPI
         {
             if (arguments.Any())
             {
-
                 Framework.Command result = this.CommandManager.Get(arguments[0]);
                 if (result == null)
                     this.Monitor.Log("There's no command with that name.", LogLevel.Error);