MbPathinfoTest: add additional test cases for `testMb_pathinfoWithoutOptions()`
MbPathinfoTest: add additional test cases for `testMb_pathinfoWithoutOptions()`

Including test cases with:
* Spaces in the paths.
* Incomplete file paths.

Note: the "empty string" test may need looking at.... should this return an empty array instead ?

jimjag/PHPMailer,PHPMailer/PHPMailer,nawawi/PHPMailer,PHPMailer/PHPMailer,nawawi/PHPMailer,jimjag/PHPMailer