!732 [fix] 解决委托、转办时nextTasks为空导致空指针的问题

* [fix] 解决委托、转办时nextTasks为空导致空指针的问题

ruoyi-modules/ruoyi-workflow/src/main/java/org/dromara/workflow/listener/WorkflowGlobalListener.java

@@ -125,7 +125,7 @@ public class WorkflowGlobalListener implements GlobalListener {
             if (StringUtils.isNotBlank(status)) {
                 flowProcessEventHandler.processHandler(definition.getFlowCode(), instance, status, params, false);
             }
-            if (task != null && nextTasks.size() == 1 && flwCommonService.applyNodeCode(definition.getId()).equals(nextTasks.get(0).getNodeCode())) {
+            if (task != null && CollUtil.isNotEmpty(nextTasks) && nextTasks.size() == 1 && flwCommonService.applyNodeCode(definition.getId()).equals(nextTasks.get(0).getNodeCode())) {
                 //如果为画线指定驳回 线条指定为驳回 驳回得节点为申请人节点 则修改流程状态为退回
                 flowProcessEventHandler.processHandler(definition.getFlowCode(), instance, BusinessStatusEnum.BACK.getStatus(), params, false);
                 //修改流程实例状态