Show (Global-)Area only with content

Using Concrete / Help
1

Hi!
I want to include a GlobalArea in my template like:

<div class="container">
    <div class="row justify-content-center my-2">
        <div class="col-md-10 alert alert-warning">
            <?php
            $a = new GlobalArea('Infobox');
            $a->setBlockLimit(1);
            $a->display();
            ?>
        </div>
    </div>
</div>

How can I change this code, that the ‘div container’ will be shown only if there was a Block added to the Area?

Thank you!

2 
<?php
$c = Page::getCurrentPage();
$a = new GlobalArea('Infobox');
$numBlocks = $a->getTotalBlocksInArea($c);
if ($numBlocks == 1) { ?>
     <div class="container"> ...
<?php } ?>
3

Thank you for your suggestion, @enlil

After a little bit of trial and error, here is my solution:

<?php
$c = Page::getCurrentPage();
$infobox = new GlobalArea('Infobox');
$infobox->setBlockLimit(1);
$numBlocks = $infobox->getTotalBlocksInArea($c);
if ($numBlocks == 1 || $c->isEditMode()) { ?>
<div class="container">
    <div class="row justify-content-center my-2">
        <div class="col-md-10 alert alert-warning">
			<?= $infobox->display(); ?>
        </div>
    </div>
</div>
<?php } ?>
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