[Etoys] [FIX]SqueakMapLoader

[Yoshiki Ohshima]

  Thank you, Karl,

  I haven't tested all possible corner cases, but did a few variations
with your change set.  It is (again) that our central focus is not on
making SqueakMap works (as there is not a simple way to open a
SqueakMapLoader for a typical etoys user), but I do understand that it
is good to make it work anyway.  I published this change to the
stream.

  Thanks again for the improvement!

-- Yoshiki