Fix Error when getDisplayName-Method of KeycloakUser is null #46
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Fixes errormessage if getDisplayName returns null.
Update KeycloakUser.php
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Fix Exception: "IDCI\Bundle\KeycloakSecurityBundle\Security\User\KeycloakUser::__toString(): Return value must be of type string, null returned"
Exception occurs, when the getDisplayName() Method returns null.