Generated factory: nullable types support

[matej21]

No description provided.

[coveralls]

Changes Unknown when pulling 63106a2 on matej21:feature/gen_factory_nullable into ** on nette:master**.

[dg]

@coveralls I have reported you as spam.

[TomasVotruba]

@dg What about using Scrutinizer? It doesn't spam and doesn't report false negative on test when coverage is decreased.

I use it on every project and I'm very happy with that.

[dg]

@matej21 it is not a correct solution, it will not work for example with function create(?string $title, ?Foo $foo, ?int $lorem = 1): Article;