事项材料附件自动下载；材料加入公共库，公共库加入材料

single-matter/src/main/java/com/mortals/xhx/module/site/service/impl/SiteDatumLibraryServiceImpl.java

@@ -43,6 +43,9 @@ public class SiteDatumLibraryServiceImpl extends AbstractCRUDServiceImpl<SiteDat
 
     @Override
     public Rest<String> addToMatterDatum(String libraryIds, Long matterId, Context context) {
+        if (ObjectUtils.isEmpty(matterId)) {
+            throw new AppException("请选择对应事项");
+        }
         List<Long> libraryIdList = Arrays.asList(libraryIds.split(",")).stream().map(Long::parseLong).collect(Collectors.toList());
         SiteDatumLibraryQuery query = new SiteDatumLibraryQuery();
         query.setIdList(libraryIdList);