<li class="tweet" style="display: list-item;">
<div class="tweet_text_1">
<i class="fa fa-twitter" aria-hidden="true"></i>
</div>
</li>
Not tested, but I think this might be able to do it:
var tweets = document.getElementsByClassName("tweet");
for (var i = 0; i < tweets.length; i++) {
if (tweets[i].textContent.length <= 1) {
tweets[i].parentNode.removeChild(tweets[I]);
}
}
(I said <= 1 because I think the icon might count as a character?)