Debezium doesn't report absence of Instant Client

Running debezium/connect:0.8.3.Final and debezium/connect:0.9.0.Beta1 with the io.debezium.connector.oracle.OracleConnector there is no indication if the Oracle Instant Client libraries are missing. The connector runs, no errors are thrown; but no CDC is done either

Even crashing out in a heap would be better than this, because it gives the user the impression that all is OK.

(From gitter discussion I understand now that Debezium docker image needs to be built to include the Instant Client, but this wasn't clear from the docs)