How can you have a sidebar without a sidebar template? Easy!
In the default theme, you've got this:
index.php
PHP Code:
<!-- SIDEBAR -->
<?php
// plugin hook
$result = $h->pluginHook('theme_index_sidebar');
if (!$result) {
$h->displayTemplate('sidebar');
}
?>
sidebar.php
PHP Code:
<div id="sidebar">
<?php $h->pluginHook('widget_block', '', array(1)); ?>
</div>
So you could just move the sidebar code into your index template and delete the sidebar template altogether! 
index.php
PHP Code:
<!-- SIDEBAR -->
<?php
// plugin hook
$result = $h->pluginHook('theme_index_sidebar');
if (!$result) { ?>
<div id="sidebar">
<?php $h->pluginHook('widget_block', '', array(1)); ?>
</div>
<?php } ?>
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