.table-bordered inside .panel does not show horizontal border between <thead> and first child of <tbody> (Chrome and Safari)

Created by: andmor-

When using a table-bordered inside a panel and with <thead> and <tbody> child elements, the border between the header and the first <tbody> element is not displayed. This happens for me on Chrome 32.0.1700.107 and Safari 7.0.1 (9537.73.11). Firefox 27.0 does not suffer from the problem. (All on OS X 10.9.1) Fiddle: http://jsfiddle.net/andmor/7yPTL/1/