GaussianBlurNode: Remove useless check. (#29611)

examples/jsm/tsl/display/GaussianBlurNode.js

@@ -152,14 +152,6 @@ class GaussianBlurNode extends TempNode {
 
 		const textureNode = this.textureNode;
 
-		if ( textureNode.isTextureNode !== true ) {
-
-			console.error( 'GaussianBlurNode requires a TextureNode.' );
-
-			return vec4();
-
-		}
-
 		//
 
 		const uvNode = textureNode.uvNode || uv();