Fix index error due to missing previously selected shapes in current image #1503
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The problem (#1396) can be reproduced by selecting a shape in current image
a, and go on next imagebthen press backspace to delete point.self.selectedShapesis in imageathus it doesn't exist in any shapes in imageb.Another possible solution is to clear selected shapes after loading a new image, but user may want to go back to original image and use those selected shapes.