fix issue1702 不创建对象的写，无法正常写入数据

src/main/java/com/alibaba/excel/write/executor/ExcelWriteAddExecutor.java

@@ -93,7 +93,7 @@ public class ExcelWriteAddExecutor extends AbstractExcelWriteExecutor {
         if (dataIndex >= oneRowData.size()) {
             return;
         }
-        if (headMap.size() != 0) {
+        if (dataIndex != 0) {
             cellIndex++;
         }
         int size = oneRowData.size() - dataIndex;

src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java

@@ -503,14 +503,14 @@ public class WriteTest {
     }
 
     @Test
-    public void noModelSimpleWriteWithOneHead() {
+    public void noModelWriteWithOneHead() {
         // 写法1
         String fileName = TestFileUtil.getPath() + "noModelSimpleWrite" + System.currentTimeMillis() + ".xlsx";
         // 这里 需要指定写用哪个class去写，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
-        EasyExcel.write(fileName).head(noModelSimpleOneHead()).sheet("模板").doWrite(dataList());
+        EasyExcel.write(fileName).head(noModelOneHead()).sheet("模板").doWrite(dataList());
     }
 
-    private List<List<String>> noModelSimpleOneHead() {
+    private List<List<String>> noModelOneHead() {
         List<List<String>> list = new ArrayList<List<String>>();
         List<String> head0 = new ArrayList<String>();
         head0.add("表头1");