possible fix for hideOrShowFeedCategory IE7 bug

functions.js

@@ -775,6 +775,8 @@ function hideOrShowFeedsCategory(doc, node, hide, cat_node) {
 		for (i = 0; i < node.childNodes.length; i++) {
 			if (node.childNodes[i].nodeName != "LI") { continue; }
 
+			if (node.childNodes[i].style != undefined) {
+
 				var has_unread = (node.childNodes[i].className != "feed");
 	
 	//			debug(node.childNodes[i].id + " --> " + has_unread);
@@ -790,11 +792,16 @@ function hideOrShowFeedsCategory(doc, node, hide, cat_node) {
 				if (has_unread) {
 					cat_unread++;
 				}
-
+			}
 		}
 	}	
 
 	if (cat_unread == 0) {
+		if (cat_node.style == undefined) {
+			debug("ERROR: supplied cat_node " + cat_node + 
+				" has no styles. WTF?");
+			return;
+		}
 		if (hide) {
 			cat_node.style.display = "none";
 		} else {