JQuery
if(text){
text = text.replace(/\n{0,}$/,"\n\n");
}
if(text)・・・JS中身の文字があるなら
https://qiita.com/_Hammer0724/items/3d21ef84813ee82e8252
正規表現
$ ・・・末尾
{0,} ・・・0個以上
０以上の開業文字列を、1行開けた状態にする。
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