Converter转换规则变更，空对象、空值转为Bean时，创建默认对象，而非nul

hutool-json/src/test/java/cn/hutool/json/Issue3649Test.java

@@ -0,0 +1,17 @@
+package cn.hutool.json;
+
+import lombok.Data;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class Issue3649Test {
+	@Test
+	public void toEmptyBeanTest() {
+		final Object bean = JSONUtil.toBean("{}", JSONConfig.create().setIgnoreError(true), EmptyBean.class);
+		assertEquals(new EmptyBean(), bean);
+	}
+
+	@Data
+	public static class EmptyBean {}
+}