修复HttpUtil.normalizeParams规则问题（issue#IBQIYQ@Gitee）

hutool-http/src/test/java/cn/hutool/http/IssueIBQIYQTest.java

@@ -0,0 +1,20 @@
+package cn.hutool.http;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class IssueIBQIYQTest {
+	@Test
+	void normalizeParamsTest1() {
+		Map<String, Object> map = new HashMap<>();
+		map.put("id", "");
+		map.put("type", "4");
+		String url = HttpUtil.toParams(map);
+		Assertions.assertEquals("id=&type=4", url);
+		url = HttpUtil.normalizeParams(url, null);
+		Assertions.assertEquals("id=&type=4", url);
+	}
+}