_pytest.mark: fix unconfigure after bad configure, still potential bug
_pytest.mark: fix unconfigure after bad configure, still potential bug

tomviner/pytest,nicoddemus/pytest,davidszotten/pytest,Akasurde/pytest,tomviner/pytest,alfredodeza/pytest,rmfitzpatrick/pytest,ddboline/pytest,markshao/pytest,pytest-dev/pytest,txomon/pytest,RonnyPfannschmidt/pytest,hackebrot/pytest,The-Compiler/pytest,flub/pytest,tareqalayan/pytest,The-Compiler/pytest,pfctdayelise/pytest,MichaelAquilina/pytest,nicoddemus/pytest