fix a few more warnings

classes/rssutils.php

@@ -591,12 +591,12 @@ class RSSUtils {
 				 * the icon avgcolor again (unless the icon got updated) */
 
 				$favicon_file = ICONS_DIR . "/$feed.ico";
-				$favicon_modified = @filemtime($favicon_file);
+				$favicon_modified = file_exists($favicon_file) ? filemtime($favicon_file) : -1;
 
 				Debug::log("checking favicon...", Debug::$LOG_VERBOSE);
 
 				self::check_feed_favicon($site_url, $feed);
-				$favicon_modified_new = @filemtime($favicon_file);
+				$favicon_modified_new = file_exists($favicon_file) ? filemtime($favicon_file) : -1;
 
 				if ($favicon_modified_new > $favicon_modified)
 					$favicon_avg_color = '';

plugins/af_unburn/init.php

@@ -69,7 +69,6 @@ class Af_Unburn extends Plugin {
 
 					$real_url = preg_replace("/\?$/", "", $real_url);
 
-					$article["plugin_data"] = "unburn,$owner_uid:" . $article["plugin_data"];
 					$article["link"] = $real_url;
 				}
 		}