Fix: Try to authenticate with client credentials when refreshtoken not available

src/main/java/org/genesys2/client/oauth/GenesysClient.java

@@ -326,7 +326,7 @@ public class GenesysClient {
 				throw new OAuthAuthenticationException("Refresh token not valid, please re-authenticate");
 			}
 		} else {
-			throw new OAuthAuthenticationException("No refresh token, please re-authenticate");
+			authenticate();
 		}
 	}