feat: 撤回按钮报错修改

src/views/secondDev/approveFlowPage.vue

@@ -339,7 +339,11 @@
 
     function getBackNode() {
         getDrawNode(processId.value).then(res => {
+            if (res.length) {
                 drawNode.value = res[0].activityId
+            } else {
+                drawNode.value = ''
+            }
         })
     }