增加店内执行计划导出/入功能：处理空值月份信息

src/main/java/com/sfa/operation/service/sales/export/impl/ExportExcelServiceImpl.java

 package com.sfa.operation.service.sales.export.impl;
 
 import com.sfa.common.core.domain.R;
+import com.sfa.common.core.enums.ECode;
+import com.sfa.common.core.exception.CheckedException;
 import com.sfa.operation.factory.ApExportExcelStrategyFactory;
 import com.sfa.operation.pojo.sales.request.SalesApRequest;
 import com.sfa.operation.service.sales.export.IExportExcelService;
@@ -27,6 +29,9 @@ public class ExportExcelServiceImpl implements IExportExcelService {
 
     @Override
     public R exportApDisplayExcel(SalesApRequest salesApRequest, HttpServletResponse response) {
+        if (salesApRequest.getSalesMonth() == null || salesApRequest.getSalesMonth().trim().isEmpty()){
+            throw new CheckedException(ECode.SALES_AP_EXPORT_ERROR);
+        }
         try {
             IExportApExcelStrategy strategy = exportApExcelStrategyFactory.getStrategy(salesApRequest.getPageType());
             String fileNamePrefix = strategy.getExportFileNamePrefix();