Disabling CookieRedirector throws Exception

[GALPR]

Q	A
Bug report?	yes
Feature request?	no
BC Break report?	no
RFC?	no

An exception is thrown when disabling the CookieRedirector service via the following config:

i18n:
  registry:
    redirector:
      cookie:
        enabled: false

"cookie" redirector identifier does not exist

The line that causes this issue is

pimcore-i18n/src/EventListener/DetectorListener.php

Line 104 in fac7a85

 $cookieRedirector = $this->redirectorRegistry->get('cookie'); 

I think this statement could simply be wrapped in if ($this->redirectorRegistry->has('cookie')).

[Stefan Hagspiel]

This is a regression of #147

[Stefan Hagspiel]

fixed in 5.0.1