fix code

hutool-poi/src/test/java/org/dromara/hutool/poi/excel/writer/ExcelWriteTest.java

@@ -213,6 +213,17 @@ public class ExcelWriteTest {
 		writer.close();
 	}
 
+	@Test
+	@Disabled
+	public void mergeNotExistCellTest(){
+		final ExcelWriter writer = ExcelUtil.getWriter()
+			.merge(5);
+
+		writer
+			.flush(FileUtil.file("d:/test/mergeNotExist.xlsx"), true)
+			.close();
+	}
+
 	@Test
 	@Disabled
 	public void mergeTest2() {