(legacy) fix for crashreport ....failed to open stream: No such file or...

(legacy) fix for crashreport ....failed to open stream: No such file or directory in /usr/local/www/guiconfig.inc on line 361

src/www/guiconfig.inc

@@ -358,11 +358,13 @@ function clear_log($logfile, $restart_syslogd = true)
 	}
 
 	/* preserve file ownership and permissions */
+	if (file_exists($logfile)) {
 		$handle = fopen($logfile, 'r+');
 		if ($handle) {
 			ftruncate($handle, 0);
 			fclose($handle);
 		}
+	}
 
 	if ($restart_syslogd) {
 		system_syslogd_start();