I think you need to remove both spacer_open AND spacer_close in order for it to look right. I did it on my harddrive and it looked fine. Like this (copy/pasted from yours above):
In this code:
<!-- post #$post[postid] -->
<if condition="$show['spacer']">
<div id="edit$post[postid]" style="padding:0px 0px $stylevar[cellpadding]px 0px">
<if condition="!$post['islastshown']"><!-- this is not the last post shown on the page --></if>
</if>
$postbit
<if condition="$show['spacer']">
</div>
</if>
<!-- / post #$post[postid] -->
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