Add option to handle empty lines (e.g., remove/leave one)

[Ark667]

Would be great an option to set empty or blank lines removal.

[PhyxionNL]

Some whitespace features would be great and not just for empty lines. For example, I would like to replace some duplicated empty lines with one empty line. And each child element needs to end with one empty line.

[grochocki]

I would like to replace some duplicated empty lines with one empty line.

I think the setting could be something along the lines of "Empty Line Handling" with options to "Remove"/"Leave One".