Return a bool from is_driver() and is_exe() again - #646

#592 turned the if ... return True / return False at the end of is_driver() and is_exe() into one return a and b . the first operand is a set in is_driver() and an int in is_exe() , so when it is empty the function returns it , set() or 0 , instead of False :

>>> pe = pefile.PE("cmd.exe")
>>> pe.is_driver()
set()
>>> json.dumps({"is_driver": pe.is_driver()})
TypeError: Object of type set is not JSON serializable

so pe.is_driver() is False is no longer true for most files . v2024.8.26 still has the old code , so this is not in a release yet .

the fix wraps the first operand in bool() , the same way #607 did for has_dynamic_relocs() . over the 356 files in pefile-tests every result is a bool now and none changes its truth value . the new test fails before each change , with set() is not False and 0 is not False .