Revert "WebXR: check for null render target (supermedium#15) (superme…

…dium#17)"

This reverts commit 5b5b032.

src/renderers/WebGLRenderer.js

@@ -2416,7 +2416,7 @@ class WebGLRenderer {
 
 			renderTargetProperties.__autoAllocateDepthBuffer = depthTexture === undefined;
 
-			if ( ! renderTargetProperties.__autoAllocateDepthBuffer && ( ! _currentRenderTarget || ! _currentRenderTarget.isWebGLMultiviewRenderTarget ) ) {
+			if ( ! renderTargetProperties.__autoAllocateDepthBuffer && ! _currentRenderTarget.isWebGLMultiviewRenderTarget ) {
 
 				// The multisample_render_to_texture extension doesn't work properly if there
 				// are midframe flushes and an external depth buffer. Disable use of the extension.