Compensate for the IntelligibilityEnhancer processing delay in high bands

webrtc/common_audio/blocker.cc

Index: webrtc/common_audio/blocker.cc
diff --git a/webrtc/common_audio/blocker.cc b/webrtc/common_audio/blocker.cc
index 86dfdf36445ec691e6e9d6ee4d3533d60b8e4dfa..2d84954c24be90ff4e7140b90bf1ee6effb8cbef 100644
--- a/webrtc/common_audio/blocker.cc
+++ b/webrtc/common_audio/blocker.cc
@@ -211,12 +211,10 @@ void Blocker::ProcessChunk(const float* const* input,
   }
 
   // Copy output buffer to output
-  CopyFrames(output_buffer_.channels(),
-             0,
-             chunk_size_,
-             num_output_channels_,
-             output,
-             0);
+  if (output != nullptr) {
+    CopyFrames(output_buffer_.channels(), 0, chunk_size_, num_output_channels_,
+               output, 0);
+  }
 
   // Copy output buffer [chunk_size_, chunk_size_ + initial_delay]
   // to output buffer [0, initial_delay], zero the rest.