修改bug

client/src/pages/learn/courseDetail.vue

@@ -94,7 +94,7 @@
                     <!-- <div class='course-name'>{{item.courseName}}</div> -->
                   </div>
                 </template>
-                <template v-if='!discussList.length || !domLength'>
+                <template v-if='!discussList.length && !domLength'>
                   <div class='no-data'>暂无相关讨论</div>
                 </template>
               </div>