Catch database errors, set fallback tz

The fallback timezone is set in case an error occurs
before setupTimezone() is entered. In this case the user
is presented with an warning about missing timezone settings
if the php.ini doesn't contain timezone information

refs #4529

library/Icinga/Application/Web.php

@@ -308,13 +308,14 @@ class Web extends ApplicationBootstrap
                     try {
                         $initialPreferences = $preferenceStore->load();
                     } catch (Exception $e) {
-                        Logger::fatal(
+                        Logger::warn(
                             '%s::%s: Could not load preferences from provider. '
                             . 'An exception during bootstrap was thrown: %s',
                             __CLASS__,
                             __FUNCTION__,
                             $e->getMessage()
                         );
+                        $this->registerFallbackPreferenceProvider($preferences, $user);
                     }
 
                     $sessionStore->writeAll($initialPreferences);

public/index.php

@@ -2,6 +2,7 @@
 // {{{ICINGA_LICENSE_HEADER}}}
 // {{{ICINGA_LICENSE_HEADER}}}
 
+date_default_timezone_set('UTC');
 require_once dirname(__FILE__). '/../library/Icinga/Application/ApplicationBootstrap.php';
 require_once dirname(__FILE__). '/../library/Icinga/Application/Web.php';