[ticket/14492] Only show fail of extension install if it's available

PHPBB3-14492

phpBB/phpbb/install/module/install_finish/task/install_extensions.php

@@ -125,13 +125,13 @@ class install_extensions extends \phpbb\install\task_base
 					// Create log
 					$this->log->add('admin', ANONYMOUS, '', 'LOG_EXT_ENABLE', time(), array($ext_name));
 				}
-			}
 				else
 				{
 					$this->iohandler->add_log_message(array('CLI_EXTENSION_ENABLE_FAILURE', $ext_name));
 				}
 			}
 		}
+	}
 
 	/**
 	 * {@inheritdoc}