The option of deleting all empty lines would be a great addition to an otherwise great editor

You could do something like this:
cmd+f
turn on regex mode (leftmost toggle button)
search for “^\s*$” without the quotes
find all
backspace

If you want only completely empty lines and not just blank ones, search for “^$” instead.

Thank you!

This saved me

I’m using windows 10.

This does not work for me.

Any ideas?

You might not have Search by Regular Expressions active, you can verify this by checking the icons on the left of the search window.