fix bug

hutool-core/src/main/java/cn/hutool/core/bean/copier/MapToMapCopier.java

@@ -50,6 +50,10 @@ public class MapToMapCopier extends AbsCopier<Map, Map> {
 				return;
 			}
 			sValue = entry.getValue();
+			// 忽略空值
+			if (copyOptions.ignoreNullValue && sValue == null) {
+				return;
+			}
 
 			final Object targetValue = target.get(sKey);
 			// 非覆盖模式下，如果目标值存在，则跳过

hutool-core/src/test/java/cn/hutool/core/bean/BeanUtilTest.java

@@ -575,6 +575,21 @@ public class BeanUtilTest {
 		Assert.assertNull(BeanUtil.copyProperties(null, Food.class));
 	}
 
+	@Test
+	public void copyPropertiesMapToMapIgnoreNullTest() {
+		// 测试MapToMap
+		final Map<String, Object> p1 = new HashMap<>();
+		p1.put("isSlow", true);
+		p1.put("name", "测试");
+		p1.put("subName", null);
+
+		final Map<String, Object> map = MapUtil.newHashMap();
+		BeanUtil.copyProperties(p1, map, CopyOptions.of().setIgnoreNullValue(true));
+		Assert.assertTrue((Boolean) map.get("isSlow"));
+		Assert.assertEquals("测试", map.get("name"));
+		Assert.assertFalse(map.containsKey("subName"));
+	}
+
 	@Test
 	public void copyBeanPropertiesFilterTest() {
 		final Food info = new Food();