fix: 查看已删除流程详情报错的问题

src/views/plugin/workflow/pages/process/form/detail.vue

@@ -154,6 +154,12 @@ export default {
         const { variables, status } = process
 
         let { allForm, taskForm, formList } = form
+        if  (!allForm && !taskForm && !formList) {
+          this.$message.error('未获取到表单信息或流程已不存在')
+          this.handleCloseTag()
+          this.$router.go(-1)
+          return
+        }
         if (formList && formList.length > 0) {
           const options = {
             menuBtn: false,