NPE when sending an invalid content with an invalid operationdefinition on Translate

[prb112]

Describe the bug
at com.ibm.fhir.server.util.FHIROperationUtil.getInputParameters(FHIROperationUtil.java:162)
Generates an NPE

Environment
Which version of IBM FHIR Server?
4.9.0

To Reproduce
POST /fhir-server/api/v4/ConceptMap/$translate HTTP/2
User-Agent: PostmanRuntime/7.28.0
Accept: /
Cache-Control: no-cache
Accept-Encoding: gzip, deflate
Content-Length: 1181
{
"resourceType": "ConceptMap",
"id": "snomed-ucum",
"url": "http://ibm.com/fhir/ConceptMap/snomed-ucum",
"version": "0.1.0",
"status": "draft",
"sourceCanonical": "http://snomed.info/sct?fhir_vs",
"targetCanonical": "http://hl7.org/fhir/ValueSet/ucum-common",
"group": [
{
"source": "http://snomed.info/sct",
"target": "http://unitsofmeasure.org",
"targetVersion": "2015",
"element": [
{
"code": "258672001",
"target": [
{
"code": "cm",
"equivalence": "equivalent",
"comment": "exact match"
}
]
},
{
"code": "258773002",
"target": [
{
"code": "mL",
"equivalence": "equivalent",
"comment": "exact match"
}
]
}
]
}
]
}
HTTP/2 500 Internal Server Error
Date: Tue, 24 Aug 2021 06:42:21 GMT
Content-Type: application/fhir+json
Content-Length: 258
Content-Language: en-US
Strict-Transport-Security: max-age=15724800; includeSubDomains
{
"resourceType": "OperationOutcome",
"issue": [
{
"severity": "fatal",
"code": "exception",
"details": {
"text": "NullPointerException: <null message>"
}
}
]
}

Expected behavior
A clear and concise description of what you expected to happen.

Additional context
Add any other context about the problem here.

[prb112]

QA: Confirm that this works as designed, and is resilient to bad data.