Remove unnecessary validation from "Factory" class
Remove unnecessary validation from "Factory" class

The "ReflectionClass" throws an exception if the class cannot be found,
for that reason the validation with the "class_exists()" function was
unnecessary.

Signed-off-by: Henrique Moody <3be1622bc44cadc0ae4da5043bd847b230c854e8@gmail.com>

Respect/Validation,Respect/Validation