Remove a comma the end of the tombstone_name to fix json deserialization

[feng-j678]

[x] the extra comma at the end of tombstone_name is causing json deserialization error, this extra comma is creating a tuple/list when tombstone is output in status file, so during json deserialization step of the data it will be unable to deserialize the tuple since it's supposed to be a string
[x] prior code change:

[x] post code change:

[x]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.26%. Comparing base (6cf2812) to head (9d02fbf).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #283   +/-   ##
=======================================
  Coverage   92.26%   92.26%           
=======================================
  Files          96       96           
  Lines       16105    16105           
=======================================
  Hits        14859    14859           
  Misses       1246     1246           

Flag	Coverage Δ
python27	92.26% <100.00%> (ø)
python39	92.26% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.