Shingo Kitagawa

@tfoote Kindly ping for this issue. `view_frames` is broken in the current noetic release.

I had same problem with TF_NAN_INPUT. What is the status of this issue? ``` Error: TF_NAN_INPUT: Ignoring transform for child_frame_id "ar_marker_0" from authority "unknown_publisher" because of a nan value in...

@130s this error sometimes appears. Next time when I got this error, i will record a bag file.