[TUTORIAL] How to make a completely empty dimension

MCreator at some point stopped supporting air as main filler block, which was the easiest way to make empty dimensions, but it's not that hard to bring it back.

Step 1

First of all, make a new dimension and add only one biome, The Void (I'm not sure of other or multiple biomes work). As the filler block, but some random block, we will change it later. As fluid block put air, which still works. Now define all of the other stuff you want in your dimension (Portal, Properties,...). When you're done, save and close the element.

Step 2

Now lock the element (dimension) you just made, right click - Open mod element in code editor and select file dimensionname.json. There will be most likely more files with the same name, so select (for me) the second one from top. The location should look like src\main\resources\modname\dimensions\dimensionname.json. 

Step 3

In the file, locate

      "default_block": {
        "Name": "modnamespace:mainfillerblock"
      },
      "default_fluid": {
        "Name": "minecraft:air"
      },

And change default block name to minecraft:air

Afterwards, it should look like this:

      "default_block": {
        "Name": "minecraft:air"
      },
      "default_fluid": {
        "Name": "minecraft:air"
      },

 If you want to have a dimension with main filler block (or fluid) from another mod, you can set it here too.

Example:

      "default_block": {
        "Name": "create:limestone"
      },

⚠️ If you want to change something in the dimension later (without custom code), you will have to unlock the element and redo all of this! You might also have to unlock it when changing MCreator or Minecraft version!⚠️

That's it. it's not that hard, trust me.
Result (image)