PrintDlg minor fix

[James Hawkins]

Hi,

    If no printer is select in PrintDlg, then PrinterName is empty and
OpenPrinterW should not be called.  This should keep this error

fixme:commdlg:PRINTDLG_WMCommandW  Call to OpenPrinter did not succeed!

from happening when no printer is selected.

Changelog
    * check for empty PrinterName in printdlg.c:PRINTDLG_WMCommandW

-- 
James Hawkins
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