Palettes containing parameters shouldn't be skipped regardless of whether rows is specified

[Procyonae]

Describe the bug

The "palettes" member is skipped when "rows" is unspecified which leads to having to define empty rows like the example below which cause bloat to an otherwise nice method of simplifying mapgen and reducing bloat where palette parameters are required for nest placement.

  {
    "type": "mapgen",
    "method": "json",
    "om_terrain": "derelict_property",
    "//": "rows only defined because otherwise palettes, needed for parameter selection, throws a skipped member error",
    "object": {
      "rows": [
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        ",
        "                        "
      ],
      "fallback_predecessor_mapgen": "forest",
      "palettes": [ "derelict_variant_parameter_palette" ],
      "place_nested": [ { "chunks": [ { "param": "variant", "fallback": "derelict_property_1" } ], "x": 0, "y": 0 } ]
    }
  },

Attach save file

N/A

Steps to reproduce

Remove "rows" from "derelict_property"
Open game
Get skipped member error

Expected behavior

Remove "rows" from "derelict_property"
Open game
Everything peachy

Screenshots

No response

Versions and configuration

N/A

Additional context

No response