WebGLRenderer: Remove unnecessary code of `if`. (#24816)

src/renderers/WebGLRenderer.js

@@ -1935,6 +1935,9 @@ function WebGLRenderer( parameters = {} ) {
 		_currentActiveMipmapLevel = activeMipmapLevel;
 
 		let useDefaultFramebuffer = true;
+		let framebuffer = null;
+		let isCube = false;
+		let isRenderTarget3D = false;
 
 		if ( renderTarget ) {
 
@@ -1957,14 +1960,6 @@ function WebGLRenderer( parameters = {} ) {
 
 			}
 
-		}
-
-		let framebuffer = null;
-		let isCube = false;
-		let isRenderTarget3D = false;
-
-		if ( renderTarget ) {
-
 			const texture = renderTarget.texture;
 
 			if ( texture.isData3DTexture || texture.isDataArrayTexture || texture.isCompressedArrayTexture ) {