make sure scene exists

[Robert C. Helling]

On 17 Jan 2014, at 23:40, Dirk Hohndel <dirk at hohndel.org> wrote:

> I'm puzzled about the patch. You test for object->scene() to exist, but
> then in side the if-clause scene() is dereferenced
> 
> Is that intentional?

Maybe I totally don’t get what is going on. But I was getting errors from scene()->removeItem(xxx) that 
scene != xxxItem->scene() as the latter was null.

I was under the impression that this caused some of the crashes I was observing.

But I have to admit that the crashing I am seeing is not 100% predictable as it occurs in only 50% of the runs or it occurs at different times (at startup vs when selecting the new profile). Maybe that tricked me into the impression that this patch helped in any way. It was late at night.

Best
Robert

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Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics  
                      Scientific Coordinator                                   
                      Ludwig Maximilians Universitaet Muenchen, Dept. Physik    
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