What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind bug

/kind task

/kind feature

What does this PR do / why do we need it:
TFReaderOp would give out confusing error messages if user provided an invalid tfrecord file.

Which issue(s) this PR fixes:

Fixes #I1D9L1

Special notes for your reviewers: