user can now remove items if minItem is set

[kkz6164]

Fixed a bug where when editing a jsonform with an array type, if the minItems was set and the initial node.children.length >= minItems, it did not allow the user to remove from that array.

[kkz6164]

An example that recreates the issue. I have set the minItems to 1, and there are already 3 friends within the array, but I cannot remove them:

{
  "schema": {
    "friends": {
      "type": "tabarray",
      "minItems": 1,
      "items": {
        "type": "object",
        "title": "Friend",
        "properties": {
          "nick": {
            "type": "string",
            "title": "Nickname",
            "required": true
          },
          "gender": {
            "type": "string",
            "title": "Gender",
            "enum": [ "male", "female", "alien" ]
          },
          "age": {
            "type": "integer",
            "title": "Age"
          }
        }
      }
    }
  },
   "value": {
    "friends": [
      { "nick": "tidoust", "gender": "male", "age": 34 },
      { "nick": "titine", "gender": "female", "age": 6 },
      { "nick": "E.T.", "gender": "alien" }
    ]
  }
}

[tchapi]

Nice catch, thanks @kkz6164 !