feat: default choice

InkBlot.Tests/MultiDivertTest.cs

@@ -31,6 +31,15 @@ public class MultiDivertTest : TestBase
         ]);
     }
 
+    [Fact]
+    public void TestDefaultChoice()
+    {
+        var storyNodes = MyParseText("->");
+        storyNodes.ShouldBe([
+            new MultiDivert(new TunnelsAndDivertsList([], new TunnelListEndingDivert(null)))
+        ]);
+    }
+
     [Fact]
     public void TestReturnFromTunnel()
     {