Remove onShutdown error handler

It was causing an additional DBALException when there is no DB
connection. The logger was trying to access to the DB during the
shutdown process, causing an unhandled exception to appear in apache

lib/private/Log/ErrorHandler.php

@@ -50,26 +50,13 @@ public static function register($debug=false) {
 		} else {
 			\set_error_handler([$handler, 'onError']);
 		}
-		\OC::$server->getShutdownHandler()->register(function () use ($handler) {
-			$handler->onShutdown();
-		});
 		\set_exception_handler([$handler, 'onException']);
 	}
 
 	public static function setLogger(ILogger $logger) {
 		self::$logger = $logger;
 	}
 
-	//Fatal errors handler
-	public static function onShutdown() {
-		$error = \error_get_last();
-		if ($error && self::$logger) {
-			//ob_end_clean();
-			$msg = $error['message'] . ' at ' . $error['file'] . '#' . $error['line'];
-			self::$logger->critical(self::removePassword($msg), ['app' => 'PHP']);
-		}
-	}
-
 	/**
 	 * 	Uncaught exception handler
 	 *