Fix for turn nil body into non nil body (issues 822)

[aayush-ap]

Fix for issue 822
#822

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (d752b7e) 80.06% compared to head (189fb85) 80.26%.

Files	Patch %	Lines
v3/newrelic/transaction.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #824      +/-   ##
===========================================
+ Coverage    80.06%   80.26%   +0.19%     
===========================================
  Files          136      139       +3     
  Lines        12358    12567     +209     
===========================================
+ Hits          9895    10087     +192     
- Misses        2180     2191      +11     
- Partials       283      289       +6     

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