GH-2; removed invalid check for no emptiness of jwt public keys

Author: mzlnk

autoconfigure/src/main/java/io/mzlnk/springframework/multitenant/oauth2/resourceserver/resolver/jwt/PublicKeyJwtAuthenticationManagerResolver.java

@@ -18,8 +18,6 @@ public class PublicKeyJwtAuthenticationManagerResolver implements Authentication
     private final Map<String, AuthenticationManager> authenticationManagers;
 
     public PublicKeyJwtAuthenticationManagerResolver(Map<String, RSAPublicKey> issuersPublicKeys) {
-        Assert.notEmpty(issuersPublicKeys, "publicKeys cannot be empty");
-
         this.authenticationManagers = issuersPublicKeys.entrySet()
                 .stream()
                 .collect(Collectors.toConcurrentMap(this::retrieveIssuer, this::retrieveAuthenticationManager));