remove the noop init of PyobjMixin
remove the noop init of PyobjMixin

pytest-dev/pytest,RonnyPfannschmidt/pytest,The-Compiler/pytest,tomviner/pytest,Akasurde/pytest,alfredodeza/pytest,The-Compiler/pytest,nicoddemus/pytest,markshao/pytest,tomviner/pytest,nicoddemus/pytest