Another bug in psppsheet branch

[John Darrington]

I noticed the following problem using the psppsheet branch as of
d4ae90b2fe74d2d1427afad35d32c9e5584211ed

1. Prepare a .sav file (call it x.sav) with some data.

2. Start psppire

3. File | Open and load x.sav (dataset1)

4. File | New | Data (a new data window will appear: dataset2)

5. Using the window manager close the window for dataset1

6. In dataset2:  File | Open and load x.sav

 A lot of Gtk-Criticals appear and the program quickly crashes.

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