#306 Table View: ArrayIndexOutOfBoundsException related to sorting

[Philipp Mewes]

The following steps cause an ArrayIndexOutOfBoundsException in edu.udo.scaffoldhunter.view.table.Model line 278:
- Choosing a subsubset of the root subset
- Applying an row order, by sorting a column
- Save and load the session again
- Switch the subset back to root
- Apply another order by sorting a column
This might be related to bug #305 which describes a problem with the row order too.