fix:修复

src/modules/course-manage/offline-course/OfflineCourseData.jsx

@@ -107,7 +107,7 @@ export default class OfflineCourseData extends React.Component {
         dataIndex: "phone",
         dataIndex: "phone",
         render: (val, item) => {
         render: (val, item) => {
           return (
           return (
-            <div>{item.phone}</div>
+            <div>{item.phone || '-'}</div>
           )
           )
         },
         },
       },
       },