Fix missing emptyTexture2darray definitioin in WebGLUniforms.js

src/renderers/webgl/WebGLUniforms.js

@@ -51,9 +51,11 @@
 
 import { CubeTexture } from '../../textures/CubeTexture.js';
 import { Texture } from '../../textures/Texture.js';
+import { DataTexture2DArray } from '../../textures/DataTexture2DArray.js';
 import { DataTexture3D } from '../../textures/DataTexture3D.js';
 
 var emptyTexture = new Texture();
+var emptyTexture2darray = new DataTexture2DArray();
 var emptyTexture3d = new DataTexture3D();
 var emptyCubeTexture = new CubeTexture();