runcommand: do not replace %ROM% or %ROM_BN% tokens when empty #3551
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Empty %ROM% tokens will cause parameter issues for binaries that do not handle empty quoting without a parameter.
In some circumstances this makes sense - the binary has a sensible %ROM% default when empty.
Think empty %ROM% = game runs as default, %ROM% provided = user picked a custom level.
This PR addresses #3550.