[osg-submissions] GraphicsContext::resizedImplementation

[Vit Stancl]

When window has a decoration, it can be resized into a zero x something 
or something x zero size. In GraphicsContext::resizedImplementation it 
leads to a wrong (NaN containing) projection matrix and scene is not 
displayed (and will not be, until new projection matrix is set to camera).

This is a bit ad hoc solution, but it works.
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