fix bug: should not call PyArg_ParseTuple[AndKeywords] when there are no parameters
fix bug: should not call PyArg_ParseTuple[AndKeywords] when there are no parameters
gjcarneiro/pybindgen,ftalbrecht/pybindgen,ftalbrecht/pybindgen,cawka/pybindgen-old,gjcarneiro/pybindgen,cawka/pybindgen-old,cawka/pybindgen-old,ftalbrecht/pybindgen,cawka/pybindgen-old,gjcarneiro/pybindgen,ftalbrecht/pybindgen,gjcarneiro/pybindgen