feat(flow) flowRecord parse attachmentIds

ruoyi-flowable/src/main/java/com/ruoyi/flowable/service/impl/FlowTaskServiceImpl.java

@@ -826,8 +826,10 @@ public class FlowTaskServiceImpl extends FlowServiceFactory implements IFlowTask
             return result;
         }
         Map<String, Object> variables = ( Map<String, Object>)MapUtils.getMap(result, "form",new HashMap<>());
+        String attachmentIdsStr = MapUtils.getString(variables, ATTACHMENT_IDS_VARIABLE_KEY);
+
 //       get AttachmentIds
-        if (!variables.containsKey(ATTACHMENT_IDS_VARIABLE_KEY) || StringUtils.isBlank(MapUtils.getString(variables,ATTACHMENT_IDS_VARIABLE_KEY))) {
+        if (!variables.containsKey(ATTACHMENT_IDS_VARIABLE_KEY) || StringUtils.isBlank(attachmentIdsStr) || StrUtil.equals("[]",attachmentIdsStr)) {
             return result;
         }
 //        get Attachment info