use pages for the log list command and tell the user about the list command

src/main/java/cc/fascinated/bat/common/EmbedDescriptionBuilder.java

@@ -12,6 +12,9 @@ public class EmbedDescriptionBuilder {
     private final StringBuilder builder = new StringBuilder();
 
     public EmbedDescriptionBuilder(String title) {
+        if (title == null) {
+            return;
+        }
         builder.append("**").append(title).append("**").append("\n");
     }