Check if widget title exists

Hello all, this is my first post here at WP and I am a little new at this but so far am really enjoying using WP.

The first thing I cannot find in the docs is how to check if a Widget’s title is defined.

The reason is that as it stands if there is no header defined the empty h4 tags still of course apply line-height which means even an empty title still takes up space, not a big deal but it interrupts the design a bit when there isn’t a title along with widgets that do have titles. Ideally i want to check for the title, if it doesn’t exist then I would not render a h4 tag.

Also, I am not sure where this logic should be applied, if it belongs in the sidebar or functions files. Any help would be great.

Scripts are as follows

— [functions.php] —

<?php
if ( function_exists('register_sidebar') )
register_sidebar(array('name'=>'sidebar1',
'before_widget' => '<div class="widget">',
'after_widget' => '</div>',
'before_title' => '<h4>',
'after_title' => '</h4>',
));
register_sidebar(array('name'=>'sidebar2',
'before_widget' => '',
'after_widget' => '',
'before_title' => '<h4>',
'after_title' => '</h4>',
));
?>

— [sidebar.php] —

<?php if ( !function_exists('dynamic_sidebar')
|| !dynamic_sidebar() ) : ?>
<?php endif; ?>

— [index.php] —

<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar('sidebar1') ) : ?>
<?php endif; ?>