4
I can tell you how to hide it completely but not depending on it's contents...it would be more like Zyspec's way for it to be dynamic... the trick would somewhere in the <{if}> I think, but don't take me for sure, it's little what I know of smarty.
To hide it completely, here is an example (hiding a block titled navbar):
<{if $block.title != 'navbar'}>
<{if $block.title}><div class="xo-blocktitle"><h3><{$block.title}></h3></div><{/if}>
<div class="xo-blockcontent"><{$block.content}></div>
<{/if}>
If you could find a way to do it by smarty variables I think it could be much simpler.
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