Merge branch 'dev'

renren-admin/src/main/java/io/renren/modules/activiti/service/ActTaskService.java

@@ -151,6 +151,7 @@ public class ActTaskService extends BaseServiceImpl {
                     .stream()
                     .map(index -> index.getMember())
                     .filter(Objects::nonNull)
+                    .filter(index -> !index.isEmpty())
                     .flatMap(index -> index.stream())
                     .map(index -> (String) index.get("id"))
                     .filter(index -> !userId.equals(index)) // 过滤非本人