优化未设置setType情况

src/main/java/com/aizuda/boot/modules/flw/flow/FlowTaskActorProvider.java

@@ -99,7 +99,7 @@ public class FlowTaskActorProvider implements TaskActorProvider {
         }
         List<NodeAssignee> nodeAssigneeList = nodeModel.getNodeAssigneeList();
         if (ObjectUtils.isNotEmpty(nodeAssigneeList)) {
-            if (NodeSetType.specifyMembers.eq(nodeModel.getSetType())) {
+            if (null == nodeModel.getSetType() || NodeSetType.specifyMembers.eq(nodeModel.getSetType())) {
                 // 1，指定成员
                 return nodeAssigneeList.stream().map(FlwTaskActor::ofNodeAssignee).collect(Collectors.toList());
             }