Macro expansion no arg error

[cyndyishida]

Currently if we define an Macro with empty parentheticals, it crashes when we try to call it
i.e.

#define M() 1

int main()
{
#if M()
std::cout <<"call to with parentheses" << std::endl;
#endif

    return 0;
}

returns pepper.symbol_table.PepperSyntaxError: Macro M expects args, but was given none.

but should be valid