[Bug 54379] since wine 8.0 print doesn't work any more

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54379

--- Comment #16 from Piotr Caban  ---
(In reply to MaranBr from comment #6)
> Created attachment 74015 [details]
> Trace file of print processor

The problem is visible in this line:
0374:trace:winspool:StartDocPrinterW (00000003, 1, 0021F008 {L"", L"", (null)})

Supplied DOC_INFO_1 structure passes empty string as pOutputFile. Probably we
should handle empty string in the same way as NULL here but I will need to run
some tests. Because of that, later, we're trying to use empty string as port
name.