Fix "null" instead of empty string on messages list in IE10 (#1489145)

Aleksander Machniak

2013-06-04 42574449577bd99b6feb662e1ea1eefb0fb698cc

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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;}