Fixes https://github.com/pytorch/serve/issues/1776

Test: https://colab.research.google.com/drive/1eKMiheF50YYGtPmi0WqVkeRqLk8Gbwg5?usp=sharing (would probably be better to start writing unit tests for the python backend when we have time)

The meaningful code is at the very end of the file in the try, except block

Codecov Report

Merging #1789 (1a41193) into master (7a9dd02) will decrease coverage by 0.10%. The diff coverage is 57.44%.

@@            Coverage Diff             @@
##           master    #1789      +/-   ##
==========================================
- Coverage   45.38%   45.28%   -0.11%     
==========================================
  Files          64       64              
  Lines        2591     2597       +6     
  Branches       60       60              
==========================================
  Hits         1176     1176              
- Misses       1415     1421       +6     

Impacted Files	Coverage Δ
ts/protocol/otf_message_handler.py	74.73% <57.44%> (-2.44%)	:arrow_down:

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@rohithkrn @lxning GPU CI seems to be frozen now