message: guard against rendering empty render-items
diff: @@ -111,6 +111,7 @@ export function createRenderItem(ctx: Context, drawMode: DrawMode, shaderCode: S
  getProgram: (variant: RenderVariant) => programs[variant].value,
  render: (variant: RenderVariant) => {
  + if (drawCount === 0 || instanceCount === 0) return
  const program = programs[variant].value
  const vertexArray = vertexArrays[variant]
  program.setUniforms(uniformValues)
  