How to check if a standard component has content?

You can also do this similar to Parshant's suggestion, but without overriding the component.

Freemarker allows you to assign a block of markup by using opening and closing assign directives instead of self-closing. Once you've assigned the markup to a variable, you can then use Freemarker built-ins to test the content.

For example, you could do something like:

<#assign componentOutput>
<@component id="solutions.widget.accepted-solutions-leaderboard-taplet"/>
</#assign>

<#if componentOutput?? && componentOutput?length gt 0>
<h3>Your component title</h3>
${componentOutput}
</#if>

I've not tested this exact code, but it should get you close.