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bug 86241, [null] appears when deleting all entries in "Navigator -> Languages" pref pane, r=tao, sr=darin
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@ -483,7 +483,7 @@ function AddTreeItem(doc, treeRoot, langID, langTitle)
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function UpdateSavePrefString()
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{
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var num_languages = 0;
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pref_string = null;
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pref_string = "";
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for (var item = active_languages_treeroot.firstChild; item != null; item = item.nextSibling) {
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