Fixes clear error on CanvasRenderer with no child container (#4065)
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* Fixes clear error on CanvasRenderer with no child container
https://github.com/pixijs/pixi.js/issues/4045
* Unit tests to check that .clear() can be called on a freshly created renderer with no containers added
* Wrapped WebGL test in withGL
Dave Moore
authored
on 30 May 2017
Chad Engler
committed
on 30 May 2017