can't add an index to a MagmaCollection which already has some elements

[Balázs Kósi]

Hi,

 (MagmaCollection new)
    add: Object new;
    addIndex: (MaSearchStringIndex attribute: #printString);
    yourself

 results in an MNU: MagmaIndexDescription >> indexHashesFor:

 I think this worked in a previous magma version. We are now using
 Magma client-kph.243.

 Any thoughts?

 Cheers, Balazs