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Based on your question, if you want to keep three <li>
items then simply you can check if respective tags exist or not as below:
<ul class="book-tags>
<li v-if="book.tagOne">{{book.tagOne}}</li>
<li v-if="book.tagTwo">{{book.tagTwo}}</li>
<li v-if="book.tagThree">{{book.tagThree}}</li>
</ul>
Source:stackexchange.com