Bloom PostProcessing example, error thrown when light is added

[MAG-AdrianMeredith]

The new "renderpass" post processing example throws an exception when a shadow casting light is added.

Steps to Reproduce

1. go to https://playcanvas.github.io/#/graphics/postprocessing
2. add boardEntity.addComponent('light', {type:'directional', castShadows: true}); to line 88
   3.playcanvas.js:29104 Uncaught TypeError: Cannot read properties of null (reading 'width') is found

It appears the shadowCaster camera has no render target...

[mvaligursky]

Yep, this is in preview and many things are not done. Specially, directional shadow passes and depth/color passes are not in a form to be easily added to the camera passes, and so those don't work. This should be ready for the next minor engine release (working on some of it now)

[MAG-AdrianMeredith]

No worries, its looking great just thought I'd be good to get it logged in case you weren't aware