Ignore bad namespace definitions

[]

-

{
  "@context": {
    "one": "test",
    "two": "@test:dummy",
    "three": 3
  },
  "one:foo": "bar",
  "two:foo": "bar",
  "three:foo": "bar"
}

{
  "one:foo": "bar",
  "two:foo": "bar",
  "three:foo": "bar"
}