Made sure that a child element exists before the check is done, fixes jQuery bug #3870.
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@ -700,7 +700,7 @@ try {
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// Check to see if an attribute returns normalized href attributes
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div.innerHTML = "<a href='#'></a>";
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if ( div.firstChild.getAttribute("href") !== "#" ) {
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if ( div.firstChild && div.firstChild.getAttribute("href") !== "#" ) {
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Expr.attrHandle.href = function(elem){
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return elem.getAttribute("href", 2);
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};
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