We already require PEAR, so it's not needed to check if PEAR class exists.

Sooner or later it will fail if PEAR does not exist, so better to do this sooner.

program/lib/Roundcube/bootstrap.php

@@ -100,9 +100,7 @@ if (!preg_match($regexp, $path)) {
 spl_autoload_register('rcube_autoload');
 
 // set PEAR error handling (will also load the PEAR main class)
-if (class_exists('PEAR')) {
-    @PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'rcube_pear_error');
-}
+PEAR::setErrorHandling(PEAR_ERROR_CALLBACK, 'rcube_pear_error');
 
 
 /**