improve invalid argument exception message in script arguments parser, thanks to @agallou.
improve invalid argument exception message in script arguments parser, thanks to @agallou.

agallou/atoum,agallou/atoum,mageekguy/atoum,mageekguy/atoum,jubianchi/atoum,CedCannes/atoum,mikaelrandy/atoum,vonglasow/atoum,vonglasow/atoum,tejerka/atoum,Tiross/atoum,gpaton/atoum,Tiross/atoum,GuillaumeDievart/atoum,mikaelrandy/atoum,gpaton/atoum,GuillaumeDievart/atoum,jubianchi/atoum,CedCannes/atoum,tejerka/atoum