Current code doesn't make any difference between OPT and no-OPT
except for the message is printed or not in the open_image().
So this particular change changes nothing but the availability of
this message.

In the next patches I wil introduce "empty images" to deal with
the ENOENT situation in a more graceful manner.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>