Empty argument value throws a "PHP Notice: Uninitialized string offset"

[sdecima]

If you set an argument with an empty string you get a "PHP Notice: Uninitialized string offset" because the code tries to check for the String first character.
eg:

$ php somescript.php --argument ""

[sdecima]

Clarification, this not only throws the notice I mentioned above, but it also sets the argument as false instead of setting it as an empty string "".
And it also fails in other scenarios eg:

$ php somescript.php --argument ""
$ php somescript.php --argument="" --some-other-argument
$ php somescript.php --argument= --some-other-argument
$ php somescript.php -a=""
$ php somescript.php -a=
$ php somescript.php -ab ""

All the above cases are fixed on #14