NPE with order-select containing ServiceRequest

[nradov]

When we send an order-select hook request containing a ServiceRequest resource in the draftOrders field we receive back a card with "summary": "Unable to (pre)fetch any supported bundles.".

This code appears to cause a NullPointerException when queryResponseBundle is null.
https://github.com/HL7-DaVinci/CRD/blob/master/server/src/main/java/org/hl7/davinci/endpoint/components/QueryBatchRequest.java#L95

Besides the NPE, according to @lmckenzi: "the RI should not be returning a card with a summary like that. Cards should always contain information useful to the end user. If something goes wrong, that's for the log process."
https://chat.fhir.org/#narrow/stream/180803-Da-Vinci-CRD/topic/NPE.20in.20CRD.20RI.20Server/near/391302119