style:Update the contribution guide to ensure the information is current.

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);
-                Object value =null;
-                if (dataKeySet.contains(variable)) {
-                    value = dataMap.get(variable);
+                if (!dataKeySet.contains(variable)) {
+                    continue;
                 }
+                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++));
-                    Object value =null;
-                    if (dataKeySet.contains(variable)) {
-                        value = dataMap.get(variable);
+                    if (!dataKeySet.contains(variable)) {
+                        continue;
                     }
+                    Object value = dataMap.get(variable);
                     ExcelContentProperty excelContentProperty = ClassUtils.declaredExcelContentProperty(dataMap,
                         writeContext.currentWriteHolder().excelWriteHeadProperty().getHeadClazz(), variable,
                         writeContext.currentWriteHolder());

style/STYLE.md

@@ -16,12 +16,12 @@
 * 点击`Apply`完成配置
 ![step](../img/style/eclipse/step.jpg)
 #### idea
-* 依次点击进入插件界面：`File->Settings->Plugins`，搜索 eclipse code formatter，如已有插件则不需安装，如没有，点击Search in repositories自动搜索线上插件。
+* 依次点击进入插件界面：`File->Settings->Plugins`，搜索 Adapter for Eclipse Code Formatter ，如已有插件则不需安装，如没有，点击Search in repositories自动搜索线上插件。
 ![step1](../img/style/idea/step1.png)
 * 导入`style/eclipse/codestyle.xml` 这里记住用的也是eclipse里面的 点击OK
-![step1](../img/style/idea/step2.png)
+![step2](../img/style/idea/step2.png)
 * 依次点击进入插件界面：`File->Settings->Editor->Code Style->Java->Import Scheme->Intellij IDEA code style XML`，导入`style/idea/codestyle.xml` 这里用的是idea的配置文件
-![step1](../img/style/idea/step3.png)
+![step3](../img/style/idea/step3.png)
 * 完成
 
 ### 附