Fix for sents without storage + probe

Sents using resources without being registered using
list.Set("LSEntOverlayText", ...) would not work anymore, since the
commit c0b46b10fd9aa68a890a63ebd3a971b1910604c6
Now if they are not registered in this list, it's still working, but
their resources will show up as 0/0 instead.
I've also registered the atmospheric probe in this list.