[ToadLoadin]

:-) I think it could be done with this macro:

// If nothing selected, select all.

	var currentSelection = getSelection();

	

	// A find'n replace using regular expression

	// (in selected range only).

	currentSelection.Replace("^s*$n", "", eeReplaceSelOnly | eeReplaceAll | eeFindReplaceRegExp);

	

	// earase search keyword highlighting.

	document.HighlightFind = false;

Then, you could use this macro to insert empty lines between each “none-empty” line (forgive my poor english):

// If nothing selected, select all.

	var currentSelection = getSelection();

	

	// A find'n replace using regular expression 

	// (in selected range only).

	currentSelection.Replace("n", "nn", eeReplaceSelOnly | eeReplaceAll | eeFindReplaceRegExp);

	

	// earase search keyword highlighting.

	document.HighlightFind = false;