1. ctrl-x with no selection selects the whole line - great feature
2. ctrl-x on an empty line puts an empty line to the clipboard - mostly useless, and it removes the last useful entry from the clipboard
(still accessible by shift-ctrl-v, but gone from ctrl-v - so my suggestion here is about saving one shift-press ;)
-> don't put an empty line into clipboard when ctrl-x was used to get rid of some empty lines
If someone really wants and expects to have empty lines in the clipboard, then he should explicitly select the empty lines before cutting.