Proper fix to the 'close' file crash on the new profile.

[Lubomir I. Ivanov]

On 10 February 2014 19:09, Tomaz Canabrava <tcanabrava at kde.org> wrote:
> I didn't cleared the model when closing the file ( because I never closed
> the file, sigh. )
> now it works :)
>

perhaps we should disable all buttons and clean the profile completely
when no dives are in the list.
here is another small fix for a crash in DivePlotDataModel if you
click the "star" button on the left.

lubomir
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