Fix not able to set a null output surface.

Previously, after calling MCVR.setOutput() with null, `frameProcessorManager`'s output surface is cleared. What was unexpected is `ExoPlayerInternal` notifies a zero output resolution after clearing the output surface. This zero resolution causes FrameProcessor to fail.

PiperOrigin-RevId: 501861993

library/core/src/main/java/com/google/android/exoplayer2/video/MediaCodecVideoRenderer.java

@@ -682,7 +682,10 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
         break;
       case MSG_SET_VIDEO_OUTPUT_RESOLUTION:
         Size outputResolution = (Size) checkNotNull(message);
-        if (displaySurface != null && frameProcessorManager.isEnabled()) {
+        if (outputResolution.getWidth() != 0
+            && outputResolution.getHeight() != 0
+            && displaySurface != null
+            && frameProcessorManager.isEnabled()) {
           frameProcessorManager.setOutputSurfaceInfo(displaySurface, outputResolution);
         }
         break;
@@ -2047,6 +2050,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
       checkNotNull(frameProcessor).setOutputSurfaceInfo(null);
       currentSurfaceAndSize = null;
     }
+
     /**
      * Sets the input surface info.
      *