feat: 修改 splitEnArticle 方法，修复'Do you always get up so late? It's one o'clock!' 断成两句，然后合并之后，后面的那句为空，但未被删除掉

public/sound/article/nce2-1/2.lrc

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+[ti:<3A>¸<EFBFBD><C2B8><EFBFBD>Ӣ<EFBFBD><D3A2><EFBFBD>ڶ<EFBFBD><DAB6><EFBFBD>]
+[by:http://www.TingClass.com] 
+[00:02.77]Lesson 2
+[00:04.08] Breakfast or lunch?
+[00:06.06]First listen and then answer the question:
+[00:10.85]Why was the writer&#39;s aunt surprised?
+[00:16.35]It was Sunday.I never get up early on Sundays.
+[00:21.54]I sometimes stay in bed until lunchtime.
+[00:27.48]Last Sunday I got up very late.
+[00:31.76]I looked out of the window. It was dark outside.
+[00:37.01]&#39;What a day!&#39;I thought. &#39;It&#39;s raining again.&#39;
+[00:43.20]Just then,the telephone rang.It was my aunt Lucy.
+[00:49.33]&#39;I&#39;ve just arrived by train,&#39; she said.&#39;I&#39;m coming to see you.&#39;
+[00:56.43]&#39;But I&#39;m still having breakfast,&#39;I said. &#39;What are you doing? she asked.
+[01:04.20]&#39;I&#39;m having breakfast,&#39;I repeated.
+[01:08.00]&#39;Dear me,&#39;she said.
+[01:10.88] &#39;Do you always get up so late? It&#39;s one o&#39;clock!&#39;