树形结构维护，关系保存，没查到关系判空

cdssman-service/src/main/java/com/diagbot/facade/RelationContactFacade.java

@@ -80,9 +80,12 @@ public class RelationContactFacade extends KlRelationServiceImpl {
                     }
                 }
             }
-            List<KlRelation> relationList = this.list(new QueryWrapper<KlRelation>()
-                    .in("start_id", sids)
-                    .eq("relation_id", rid));
+            List<KlRelation> relationList = Lists.newArrayList();
+            if(ListUtil.isNotEmpty(sids)){
+                relationList = this.list(new QueryWrapper<KlRelation>()
+                        .in("start_id", sids)
+                        .eq("relation_id", rid));
+            }
             List<Long> ids = relationList.stream().map(x -> x.getId()).collect(Collectors.toList());
             //先删除
             if (ListUtil.isNotEmpty(ids)) {