Allow falsy values like 0, false, empty string to be allowed values f…

[kchobantonov]

…or enums

Example schemas

{
  "type": "object",
  "properties": {
    "areYouTall": {
      "type": "boolean",
      "oneOf": [
        {
          "const": true,
          "title": "Yes"
        },
        {
          "const": false,
          "title": "No"
        }
      ]
    }
  },   
  "required": [
    "areYouTall"
  ]
}

{
  "type": "VerticalLayout",
  "elements": [
    {
      "type": "Control",
      "scope": "#/properties/areYouTall"
    }
  ]
}

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[kchobantonov]

@yaffol can you take a look into the ArrayLayoutRenderer that you have changes because this build fails that on line 458 there is no this.data - perhaps the line should be data: this.control.data, ?

@sdirix can you review this PR - this allows enums with falsy values to be used correctly otherwise it clears the input when such are selected. I was thinking about the same perhaps for the strings to eventually allow empty string for example but since the text control always have an empty value when it is cleared then we will not be able to remove properties for those types but for enums that are renders with dropdowns and etc. it is easy to implement and use those falsy values as well

[kchobantonov]

the above issue with the array renders is fixed in PR https://github.com/eclipsesource/jsonforms-vuetify-renderers/pull/76

[sdirix]

I'll check the code soon! Thanks for the contribution :heart: