Sys.println(null) causes a segmentation fault

As said in the title, trying to do `Sys.println(null)` results in a segmentation fault. From having a look through the code, it seems that from Dynamic it goes straight to hx::String, which is able to have the value `null`. However. after that there is no check whether the string is `null` before trying to print it out.

This issue might be somewhat relevant:
https://github.com/HaxeFoundation/haxe/issues/9588

EDIT: This is does not seem to be an issue on Windows.