Renderer crashes on directional lights that don't cast shadows

[vorg]

Can't set uniform "uDirectionalLights[1].projectionMatrix" with a null value as the _projectionMatrix is never defined (only for lights with castShadows) and yet it's required by renderer's uniform setting code

[dmnsgn]

Everything is set by:

• the light system:

  pex-renderer/systems/light.js

  Lines 9 to 10 in 2a426d4

  	light._projectionMatrix ??= mat4.create();
  	light._viewMatrix ??= mat4.create();

• the render pipeline:

  pex-renderer/systems/render-pipeline.js

  Lines 115 to 116 in 2a426d4

  	light._near = -light._sceneBboxInLightSpace[1][2];
  	light._far = -light._sceneBboxInLightSpace[0][2];

  
  

  pex-renderer/systems/render-pipeline.js

  Lines 170 to 171 in 2a426d4

  	// Needs to be here for multi-view with different renderer to not overwrite it
  	light._shadowMap = shadowMap;

• the components defaults:

  pex-renderer/components/directional-light.js

  Lines 9 to 12 in 9a8473b

  	color: [1, 1, 1, 1],
  	intensity: 1,
  	bias: 0.1,
  	castShadows: true,