feat: bug优化

src/views/customerService/components/chatMessageItem.vue

 <template>
   <div class="message_components">
     <!--自己发送的消息-->
-    <div v-if="chatMessageItem.msgType === 1" class="message-self">
+    <div v-if="chatMessageItem.msgType === 1 && chatMessageItem.messageContent" class="message-self">
       <div class="message-self-info">
         <div class="message-self-info_content">{{ chatMessageItem.messageContent }}</div>
         <div class="message-self-info_time">{{ chatMessageItem.time }}</div>
@@ -9,7 +9,7 @@
       <img :src="chatMessageItem.avatar" class="message-self__avatar">
     </div>
     <!--其他人发送的消息-->
-    <div v-if="chatMessageItem.msgType === 2" class="message-other">
+    <div v-if="chatMessageItem.msgType === 2 && chatMessageItem.messageContent" class="message-other">
       <img :src="chatMessageItem.avatar" class="message-other__avatar">
       <div class="message-other-info">
         <div class="message-other-info_content">