Sloc shouldn't count spurious blank lines after the code

[Luni-4]

It would be possible to create a file which has a series of blank lines after the last line of code.

[Luni-4]

Since those kind of blank lines are pretty rare, so let's close this one

[marco-c]

The blank line after the code is actually very frequent (there are some linters that enforce that). We should ignore them for sloc calculation.