misc feed edit dialog fixes

functions.js

@@ -1564,8 +1564,10 @@ function getSelectedTableRowIds(id) {
 }
 
 function editFeed(feed, event) {
-
 	try {
+		if (feed <= 0)
+			return alert(__("You can't edit this kind of feed."));
+
 		var query = "backend.php?op=pref-feeds&subop=editfeed&id=" +
 			param_escape(feed);
 

tt-rss.js

@@ -376,7 +376,11 @@ function quickMenuGo(opid) {
 		}
 
 		if (opid == "qmcEditFeed") {
+			if (activeFeedIsCat())
+				alert(__("You can't edit this kind of feed."));
+			else
 				editFeed(getActiveFeedId());
+			return;
 		}
 	
 		if (opid == "qmcRemoveFeed") {
@@ -843,7 +847,13 @@ function hotkey_handler(e) {
 			}
 
 			if (keycode == 69) { // e
+
+				if (activeFeedIsCat())
+					alert(__("You can't edit this kind of feed."));
+				else
 					editFeed(getActiveFeedId());
+				return;
+
 				return false;
 			}