Using jogl and Offscreen leads to "initial size must be positive (were (0 x 0))"

[GitHub-Ronald]

at jogamp.opengl.GLDrawableFactoryImpl.createOffscreenDrawable(GLDrawableFactoryImpl.java:409).

[stephengold]

Since jme3-jogl was removed from the Engine on 15 April 2020, this issue is no longer our responsibility.