Merge remote-tracking branch 'origin/3.x' into 3.x

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

@@ -188,6 +188,9 @@ public class ExcelWriteFillExecutor extends AbstractExcelWriteExecutor {
         WriteSheetHolder writeSheetHolder = writeContext.writeSheetHolder();
         Map<String, ExcelContentProperty> fieldNameContentPropertyMap =
             writeContext.currentWriteHolder().excelWriteHeadProperty().getFieldNameContentPropertyMap();
+        if(null == analysisCellList || analysisCellList.isEmpty()){
+            return;
+        }
         for (AnalysisCell analysisCell : analysisCellList) {
             Cell cell = getOneCell(analysisCell, fillConfig);
             if (analysisCell.getOnlyOneVariable()) {

src/test/java/com/alibaba/easyexcel/test/demo/fill/FillTest.java

@@ -80,6 +80,24 @@ public class FillTest {
         excelWriter.finish();
     }
 
+    /**
+     * 处理无变量问题
+     *
+     * @since 2.1.1
+     */
+    @Test
+    public void noVariableFill() {
+        // 模板注意 用{} 来表示你要用的变量 如果本来就有"{","}" 特殊字符 用"\{","\}"代替
+        // 填充list 的时候还要注意 模板中{.} 多了个点 表示list
+        String templateFileName =
+            TestFileUtil.getPath() + "demo" + File.separator + "fill" + File.separator + "no_variable.xlsx";
+
+        // 方案1 一下子全部放到内存里面 并填充
+        String fileName = TestFileUtil.getPath() + "listFill" + System.currentTimeMillis() + ".xlsx";
+        // 这里 会填充到第一个sheet， 然后文件流会自动关闭
+        EasyExcel.write(fileName).withTemplate(templateFileName).sheet().doFill(data());
+    }
+
     /**
      * 复杂的填充
      *