解决bug：解决其它入库单据中的再次保存的空指针异常

jshERP-boot/src/main/java/com/jsh/erp/service/depotItem/DepotItemService.java

@@ -278,12 +278,14 @@ public class DepotItemService {
         DepotItem depotItem = new DepotItem();
         try{
             DepotHead depotHead = depotHeadService.getDepotHead(linkStr);
+            if(null!=depotHead && null!=depotHead.getId()) {
                 DepotItemExample example = new DepotItemExample();
                 example.createCriteria().andHeaderIdEqualTo(depotHead.getId()).andMaterialExtendIdEqualTo(meId).andIdEqualTo(linkId).andDeleteFlagNotEqualTo(BusinessConstants.DELETE_FLAG_DELETED);
                 List<DepotItem> list = depotItemMapper.selectByExample(example);
                 if(list!=null && list.size()>0) {
                     depotItem = list.get(0);
                 }
+            }
         }catch(Exception e){
             JshException.readFail(logger, e);
         }
@@ -543,6 +545,7 @@ public class DepotItemService {
                         //在更新模式进行状态赋值
                         String unit = rowObj.get("unit").toString();
                         Long preHeaderId = depotHeadService.getDepotHead(linkStr).getId();
+                        if(null!=preHeaderId) {
                             //前一个单据的数量
                             BigDecimal preNumber = getPreItemByHeaderIdAndMaterial(linkStr, depotItem.getMaterialExtendId(), depotItem.getLinkId()).getOperNumber();
                             //除去此单据之外的已入库|已出库
@@ -555,6 +558,7 @@ public class DepotItemService {
                             }
                         }
                     }
+                }
                 if (StringUtil.isExist(rowObj.get("unitPrice"))) {
                     BigDecimal unitPrice = rowObj.getBigDecimal("unitPrice");
                     depotItem.setUnitPrice(unitPrice);