Index: wp-includes/rss.php
===================================================================
--- wp-includes/rss.php	(revision 11902)
+++ wp-includes/rss.php	(working copy)
@@ -112,11 +112,11 @@
 			}
 			elseif ( $el == 'rss' ) {
 				$this->feed_type = RSS;
-				$this->feed_version = $attrs['version'];
+				$this->feed_version = isset($attrs['version']) ? $attrs['version'] : '';
 			}
 			elseif ( $el == 'feed' ) {
 				$this->feed_type = ATOM;
-				$this->feed_version = $attrs['version'];
+				$this->feed_version = isset($attrs['version']) ? $attrs['version'] : '';
 				$this->inchannel = true;
 			}
 			return;
@@ -336,7 +336,7 @@
 			}
 		}
 		elseif ( $this->is_rss() ) {
-			$this->channel['tagline'] = $this->channel['description'];
+			$this->channel['tagline'] = isset($this->channel['description']) ? $this->channel['description'] : '';			
 			for ( $i = 0; $i < count($this->items); $i++) {
 				$item = $this->items[$i];
 				if ( isset($item['description']))
@@ -490,7 +490,7 @@
 			}
 			else {
 				$errormsg = "Failed to fetch $url. ";
-				if ( $resp->error ) {
+				if ( isset($resp->error) && $resp->error ) {
 					# compensate for Snoopy's annoying habbit to tacking
 					# on '\n'
 					$http_error = substr($resp->error, 0, -2);