Conditional hiding of tt_content div for plugin in Frontend - typo3

Question

I am using TYPO3 8 and fluid_styled_content.
In am developing an extension with the following requirements: If specific conditions are met (depending on URL query parameter) nothing should be displayed for the plugin in the Frontend. In this case, the fluid output of the plugin will be empty (depending on a variable that is set in the Controller). But TYPO3 still - by default - renders a wrapping div and the header.
So, essentially, what I get is something like:
<div id="c217" class="...">
<header>
<h2 class="...">Header</h2>
</header>
<p> <!-- plugin output here is empty -- > </p>
</div>
How do I (dynamically) prevent that?
This has been asked before, but the solutions I found will not work with fluid_styled_content:

Answer 1

You should use the FSC way.
All content is rendered with templates which use layouts and partials. Aside from the simple CEs you have a template for plugins which requests a layout which renders the header.
Enhance the (global) layout with a special condition for your plugin to avoid the header (be sure to render the header by yourself) or avoid the header if your plugin will not render any output.
EDIT:
add the override template-pathes to FSC:
lib.contentElement {
templateRootPaths {
200 = EXT:your_extension_key/Resources/Private/FSC/Templates/
}
partialRootPaths {
200 = EXT:your_extension_key/Resources/Private/FSC/Partials/
}
layoutRootPaths {
200 = EXT:your_extension_key/Resources/Private/FSC/Layouts/
}
}
now you can copy the default-layout from the FSC folder to your layout folder and add in that layout a condition which skips the header and global wrapping if your plugin is rendered.
<f:if condition="{data.CType} == 'list' && {data.list_type} == 'myPlugin'">
<f:then>
<f:comment> only plugin output </fcomment>
</f:then>
<f:else>
<f:comment> original output with headers and wrap </fcomment>
</f:else>
</f:if>