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Bugfix for polygon with 0 vertices #229

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@jpaczia jpaczia commented May 24, 2020

If a Polygon with 0 vertices is used to create a PolygonIterator the Iterator crashes during iteration.
Using this initialization of the startIndex and bufferSize variables the crash does not occur anymore in my usecase. However I don't know enough about this framework to judge if this initialization is always valid.

The crash can be reproduced using the IteratorsDemo.cpp if all calls of addVertex() in demoPolygonIterator() are removed.

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