fix:非空判断

app/src/main/kotlin/com/secspace/sms/activities/MainActivity.kt

@@ -461,6 +461,7 @@ class MainActivity : SimpleActivity() {
             val messages: java.util.ArrayList<Message> = getMessages(firstConversation.threadId, true)
             Log.d(TAG, " setFirstConversationAndUpdateData:  执行查询会话 messages 数据库  =:${GsonUtil.parseListToJson(messages)}  ")
 
+            if(messages.isEmpty()) return
             val lastMsg: Message = messages.last()
             Log.d(TAG, "setFirstConversationAndUpdateData: lastMsg = ${Gson().toJson(lastMsg)}")
             firstConversation.snippet = lastMsg.body