fix : 修复实时通话展示

src/components/liveCall/LiveCallItemHome.vue

@@ -10,7 +10,7 @@
       <div v-else><el-tag>{{ lineName  }}</el-tag></div>
     </div>
     <el-scrollbar ref="scrollbarRef" class="scrollbar">
-      <el-empty v-if="!recordObj.content" description="暂无通话" />
+      <el-empty v-if="recordObj.content?.length==0" description="暂无通话" />
       <div class="chat-content" ref="innerRef" v-else>
         <div v-for="(item,index) in recordObj.content" :key="index">
           <el-divider border-style="dotted" v-if="item.isLine">{{item.lineMsg}}</el-divider>