fix #890 - x should delete with multiple carets
fix #890 - x should delete with multiple carets

Do not delete empty lines in normal mode, even if multiple carets
are active.

himacro/Vintageous,wbcustc/Vintageous,guillermooo-forks/Vintageous,wbcustc/Vintageous,guillermooo-forks/Vintageous,gerardroche/Vintageous,xushuwei202/Vintageous,denim2x/Vintageous,vastcharade/Vintageous,xushuwei202/Vintageous,denim2x/Vintageous,zhangtuoparis13/Vintageous,guillermooo-forks/Vintageous,denim2x/Vintageous,wbcustc/Vintageous,himacro/Vintageous,zhangtuoparis13/Vintageous,zhangtuoparis13/Vintageous,vastcharade/Vintageous,xushuwei202/Vintageous,himacro/Vintageous