Merge pull request #2094 from bdecoste/master

KeyStore element in subsystem not required

adapters/saml/as7-eap6/subsystem/src/main/java/org/keycloak/subsystem/saml/as7/KeyDefinition.java

@@ -64,7 +64,6 @@ public class KeyDefinition extends SimpleResourceDefinition {
     static final ObjectTypeAttributeDefinition KEY_STORE =
             ObjectTypeAttributeDefinition.Builder.of(Constants.Model.KEY_STORE,
                     KeyStoreDefinition.ALL_ATTRIBUTES)
-                    .setAllowNull(false)
                     .build();
 
     static final SimpleAttributeDefinition[] ATTRIBUTES = {SIGNING, ENCRYPTION};