[B2-devel] [Patch] Use default ROM when ROM path preference is blank

[Michael S. <msb...@me...>]

Attached is a patch to SheepShaver, to fix a problem where the ROM  
file can only be found on the first boot.

When a user creates a new SheepShaver machine, there is no preference  
file, so there is not ROM path preference. SheepShaver has logic so  
that in this case, it will look for a ROM file named "ROM" or "Mac OS  
ROM" in the current directory.

The user starts SheepShaver in order to get to the built-in  
Preferences Editor, and changes various settings (such as creation of  
a hard disk). Then the user reboots.

If the user forgot to set the ROM path at this time, then SheepShaver  
can no longer boot. The only recourse is for the user to find and  
delete the preferences file, or use an external preferences editor to  
set the ROM path.

The fix is to change SheepShaver to use the default ROM names when  
either the rom path is null (no preference) OR an empty string  
(preference exists with no rom path).