Crash when opening planner in empty log

[Robert Helling]

Hi,

just noticed: Current master crashes with memory violation when opening the planner on an empty log.

Crash report gives stack dump as

0   Subsurface                    	       0x10a4db1ee DiveEventItem::isInteresting(dive const*, divecomputer const*, event const*, plot_info const&, int, int) + 14 (diveeventitem.cpp:200)
1   Subsurface                    	       0x10a4eb067 ProfileScene::plotDive(dive const*, int, DivePlannerPointsModel*, bool, bool, bool, bool, double, double) + 4343 (profilescene.cpp:560)
2   Subsurface                    	       0x10a4f11b8 ProfileWidget2::plotDive(dive const*, int, int) + 216 (profilewidget2.cpp:211)

Tried running in the debugger but result makes very little sense (has a dive that is not exactly null but does not contain valid data. Right now out of time to investigate this, but maybe rings a bell with one of you.

Best
Robert
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