One layer only does not compile

[nebularnoise]

I tried to compile a file where I removed all layers except layer 0, and nothing happened.
I thought the UI froze, because the Download buttons were deactivated, but I then realised this was intentional.

However, I saw an error message in the console: key[0].keycodes[layer] is undefined

I think the culprate is src/files/generators/keymap.c.js:

for (let layer = 0; layer < C.KEYMAP_MAX_LAYERS; layer ++) {
	let layerMap = '\tKEYMAP(\n\t\t';
	for (let row = 0; row < keyboard.rows; row ++) {
		for (let col = 0; col < keyboard.cols; col ++) {
			const key = keyboard.wiring[row + ',' + col];
			if (!key || !key.length) continue;
				layerMap += key[0].keycodes[layer].getCode() + ', ';
		}
		layerMap += '\n\t\t';
	}
	layerMap = layerMap.substring(0, layerMap.length - 5) + '),\n\n';
	keymaps += layerMap;
}

For some reason, that for loop looks a bit dodgy. It seems to assume that there will always be the max amount of layers.

I don't know if that is supposed to be the case.

I did modify my layout file by hand, and in order to get a clean, human-readable JSON, I removed the unused layers. If that's not supported, that should either fail gracefully or maybe add KC_TRNS keycodes by default ?