Revert change where NULL config value wasn't handled as unset (#1489202)

Aleksander Machniak

2013-06-24 2787fbe5b6f015b5ce7c86185cc6876ec892b483

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.panel_wrapper {height:85px;} 
.panel_wrapper div.current {height:85px;} 
 
/* IE */ 
* html .panel_wrapper {height:100px;} 
* html .panel_wrapper div.current {height:100px;}