[dia-git]: table attributes, bug?

[myken <myken iae nl>]

Hello list,
While working with the sources I stumbled on, what I think is, a bug
It is easy to reproduce:
- open dia (compiled from git)
- select a table from the database sheet
- double click it (or goto properties)
- select attributes
- add an attribute, click apply.
Now you have a table with an attribute.
Than the bug:
- click remove -> the attribute disappears in the dialog screen
- click apply -> nothing happens
- click OK -> nothing happens

Basically the last attribute can not be deleted. If you have more 
attributes you can delete all but the last one.

Any thoughts on where to look for the bug/solution?

Thanks,
Robert.