"is_not_null" rule has stopped working

[rguico]

This might also affect is_null; I haven't looked into it yet.

Below is the rule that I'm passing into the constructor, along with a screenshot of the resulting state.

{
  "condition": "AND",
  "rules": [
    {
      "id": "attr10",
      "field": "attr10",
      "type": "string",
      "input": "text",
      "operator": "is_not_null",
      "value": "1"
    }
  ]
}

I'll send a PR in if I can, but it seems as though you're already in the code. Thanks!