Coverage on branch when there is no branch

[glureau]

Assuming a simple data class Foo(val a: Int), and this class is used in some tests, the coverage of this class will be 100% of lines, but it will report NaN% on branch coverage. While I'm ~ok to display "NaN%", I'm bothered by the red cross next to it. Given we have at least 1 line covered in a code which has no branch, I guess we should either discard those files from the reporting or consider them 100% covered anyway.