API response type

[liuyangc3]

the response of validator valList

{
  "oncall": [
    "validator2",
    "nuked",
    "somebody",
    "hooli",
    "tidylabs-validator",
    "zondacryptocloaker",
    "cyphercore",
    "cheaky-validator",
    "kwunyeung",
    "ateam",
    "validator7",
    "castlenode-validator",
    "p2pvalidator",
    "boomergames",
    "pineapplepizza",
    "stake.fish"
  ],
  "standby": [
    "certusone",
    "yongjoo",
    "cryptocloaker",
    "lgo-supernova",
    "aliagaoglu"
  ],
  "candidates": [
    "dlive-09156526",
    "vote4us",
    "happiness",
    "mr.k.validator",
    "inheritance",
    "metacrypt",
    "nodeasy"
  ],
  "jail": null,

the value of jail is null, better use an empty array []