NullPointerException trying to handle an unannotated return type via contract-api

Using 2.2.3LTS using the contract-api I have this method

```
@Transaction(submit=false)
public QueryResponse paginatedRichQuery(Context ctx, String queryString, String pagesize, String passedBookmark) {
logger.debug("Entering paginatedRichQuery with pagesize [" + pagesize + "] and query string: " + queryString);
int pageSize = Integer.parseInt(pagesize);

final QueryResultsIteratorWithMetadata iterator = ctx.getStub().getQueryResultWithPagination(queryString, pageSize, passedBookmark);
QueryResponseMetadata metadata = iterator.getMetadata();
ArrayList results = this.getAllResults(iterator);

QueryResponse response = new QueryResponse(results.toArray(new String[results.size()]), new ResponseMetadata(metadata));
logger.debug("Exiting paginatedRichQuery with response: " + response.toString());
return response;
}
```

QueryResponse is defined as follows

```
public class QueryResponse {
private T[] results;

private ResponseMetadata responseMetadata;

public QueryResponse(T[] results, ResponseMetadata responseMetadata) {
this.results = results;
this.responseMetadata = responseMetadata;
}

public T[] getResults() {
return results;
}

public void setResults(T[] results) {
this.results = results;
}

public ResponseMetadata getResponseMetadata() {
return responseMetadata;
}

public void setResponseMetadata(ResponseMetadata responseMetadata) {
this.responseMetadata = responseMetadata;
}

}
```

When I invoke the transaction it fails due to trying because of the return value with

```
Thread[fabric-txinvoke:5,5,main] 12:04:38:330 INFO org.hyperledger.fabric.contract.ContractRouter processRequest Got routing:paginatedRichQuery:org.example.FixedAssetContract
Thread[fabric-txinvoke:5,5,main] 12:04:38:345 SEVERE org.hyperledger.fabric.Logger error nulljava.lang.NullPointerException
at org.hyperledger.fabric.contract.execution.JSONTransactionSerializer.toBuffer(JSONTransactionSerializer.java:84)
at org.hyperledger.fabric.contract.execution.impl.ContractExecutionService.convertReturn(ContractExecutionService.java:89)
at org.hyperledger.fabric.contract.execution.impl.ContractExecutionService.executeRequest(ContractExecutionService.java:67)
at org.hyperledger.fabric.contract.ContractRouter.processRequest(ContractRouter.java:119)
at org.hyperledger.fabric.contract.ContractRouter.invoke(ContractRouter.java:130)
at org.hyperledger.fabric.shim.impl.ChaincodeInvocationTask.call(ChaincodeInvocationTask.java:100)
at org.hyperledger.fabric.shim.impl.InvocationTaskManager.lambda$newTask$17(InvocationTaskManager.java:265)
at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1736)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
```