Поправил таймер, удалил викторину

src/main/java/org/sadtech/bot/core/domain/Content.java

@@ -4,6 +4,8 @@ import java.util.Objects;
 
 public abstract class Content {
 
+    public static final EmptyContent EMPTY_CONTENT = new EmptyContent();
+
     private Integer personId;
     private String message;
 

src/main/java/org/sadtech/bot/core/domain/EmptyContent.java

@@ -0,0 +1,18 @@
+package org.sadtech.bot.core.domain;
+
+public class EmptyContent extends Content {
+
+    public EmptyContent() {
+
+    }
+
+    @Override
+    public String getMessage() {
+        return "";
+    }
+
+    @Override
+    public void setMessage(String message) {
+
+    }
+}