message: Fix empty parameters when creating RenderTexture
diff: @@ -66,7 +66,7 @@ export class BaseRenderTexture extends BaseTexture
  * of the texture being generated.
  * @param {PIXI.MSAA_QUALITY} [options.multisample=PIXI.MSAA_QUALITY.NONE] - The number of samples of the frame buffer.
  */
  - constructor(options?: IBaseTextureOptions)
  + constructor(options: IBaseTextureOptions = {})
  {
  if (typeof options === 'number')
  {
  