Print plain error when the error page errors too

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/base.php

@@ -652,30 +652,35 @@ class OC {
 		if (!defined('OC_CONSOLE')) {
 			$errors = OC_Util::checkServer(\OC::$server->getSystemConfig());
 			if (count($errors) > 0) {
-				if (self::$CLI) {
-					// Convert l10n string into regular string for usage in database
-					$staticErrors = [];
-					foreach ($errors as $error) {
-						echo $error['error'] . "\n";
-						echo $error['hint'] . "\n\n";
-						$staticErrors[] = [
-							'error' => (string)$error['error'],
-							'hint' => (string)$error['hint'],
-						];
-					}
-
+				if (!self::$CLI) {
+					http_response_code(503);
+					OC_Util::addStyle('guest');
 					try {
-						\OC::$server->getConfig()->setAppValue('core', 'cronErrors', json_encode($staticErrors));
+						OC_Template::printGuestPage('', 'error', array('errors' => $errors));
+						exit;
 					} catch (\Exception $e) {
-						echo('Writing to database failed');
+						// In case any error happens when showing the error page, we simply fall back to posting the text.
+						// This might be the case when e.g. the data directory is broken and we can not load/write SCSS to/from it.
 					}
-					exit(1);
-				} else {
-					http_response_code(503);
-					OC_Util::addStyle('guest');
-					OC_Template::printGuestPage('', 'error', array('errors' => $errors));
-					exit;
 				}
+
+				// Convert l10n string into regular string for usage in database
+				$staticErrors = [];
+				foreach ($errors as $error) {
+					echo $error['error'] . "\n";
+					echo $error['hint'] . "\n\n";
+					$staticErrors[] = [
+						'error' => (string)$error['error'],
+						'hint' => (string)$error['hint'],
+					];
+				}
+
+				try {
+					\OC::$server->getConfig()->setAppValue('core', 'cronErrors', json_encode($staticErrors));
+				} catch (\Exception $e) {
+					echo('Writing to database failed');
+				}
+				exit(1);
 			} elseif (self::$CLI && \OC::$server->getConfig()->getSystemValue('installed', false)) {
 				\OC::$server->getConfig()->deleteAppValue('core', 'cronErrors');
 			}