resolver API should return not found for unmatched prefixes

[datadavev]

info or resolve for a non-existent or longer than existing naan is returning the default info response. Should adjust to return 404 Not Found.

Example (actual naan is 59512):

curl https://arks-stg.cdlib.org/ark:595122?info
...
< HTTP/2 200
...
<
{
  "pid": "ark:595122",
  "scheme": "ark",
  "content": "595122",
  "prefix": "595122",
  "value": null,
  "suffix": "95122",
  "target": "/.info/ark:595122",
  "canonical": "ark:/595122/",
  "status_code": 302,
  "properties": {
    "what": "ark",
    "name": "Archival Resource Key"
  },
  "definition": {
    "uniq": "ark:",
    "scheme": "ark",
    "prefix": "",
    "value": "",
    "target": "/.info/{pid}",
    "canonical": "ark:/{prefix}/{value}",
    "synonym_for": null,
    "values": []
  }
}

[datadavev]

Resolved.