deleteBlock helper doesn't handle the case where the layout is empty after a delete but there are already existing blocks

[JeffersonBledsoe]

Describe the bug

The deleteBlocks helper function has a functionality where if the blocks_layout key is empty after deletion, it will create a new block with the

volto/packages/volto/src/helpers/Blocks/Blocks.js

Lines 138 to 146 in 3330285

	if (newFormData[blocksLayoutFieldname].items.length === 0) {
	newFormData = addBlock(
	newFormData,
	config.settings.defaultBlockType,
	0,
	{},
	intl,
	);
	}

Possible solutions

• Leave it as is
  • Can lead to odd behaviour where you have block definitions stored that aren't used in the layout
• Leave it as is and delete the existing block data
  • Could lead to possible removal of wanted data
• Add all of the existing blocks back into the layout.
  • It may end up with a messy layout, but at least it becomes clear what is stored and what isn't
• Check if any of the existing blocks are match the default block type and add that. Fallback to one of the above behaviours if not