fix 修复fill填充空数据，可能导致行数据错乱的问题

easyexcel-core/src/main/java/com/alibaba/excel/write/executor/ExcelWriteFillExecutor.java

@@ -212,10 +212,10 @@ public class ExcelWriteFillExecutor extends AbstractExcelWriteExecutor {
 
             if (analysisCell.getOnlyOneVariable()) {
                 String variable = analysisCell.getVariableList().get(0);
-                if (!dataKeySet.contains(variable)) {
-                    continue;
+                Object value =null;
+                if (dataKeySet.contains(variable)) {
+                    value = dataMap.get(variable);
                 }
-                Object value = dataMap.get(variable);
                 ExcelContentProperty excelContentProperty = ClassUtils.declaredExcelContentProperty(dataMap,
                     writeContext.currentWriteHolder().excelWriteHeadProperty().getHeadClazz(), variable,
                     writeContext.currentWriteHolder());
@@ -247,10 +247,10 @@ public class ExcelWriteFillExecutor extends AbstractExcelWriteExecutor {
 
                 for (String variable : analysisCell.getVariableList()) {
                     cellValueBuild.append(analysisCell.getPrepareDataList().get(index++));
-                    if (!dataKeySet.contains(variable)) {
-                        continue;
+                    Object value =null;
+                    if (dataKeySet.contains(variable)) {
+                        value = dataMap.get(variable);
                     }
-                    Object value = dataMap.get(variable);
                     ExcelContentProperty excelContentProperty = ClassUtils.declaredExcelContentProperty(dataMap,
                         writeContext.currentWriteHolder().excelWriteHeadProperty().getHeadClazz(), variable,
                         writeContext.currentWriteHolder());