fix: Undefined stns in blob Trace

[cwli24]

Fix an instance of undefined error in Session Trace feature introduced in v1.259.0. Harvest will now no longer be attempted if there are no trace nodes to send.

Overview

Fix a scenario wherein stns is undefined and causing problem when .length property is accessed for it. Instead, prepareHarvest will early exit when such is the case.

Related Issue(s)

https://new-relic.atlassian.net/browse/NR-270488

Testing

Component test added

[github-actions]

Asset Size Report

Merging this pull request will result in the following asset size changes:

Agent	Asset	Previous Size	New Size	Diff
lite	loader	31.44 kB / 11.03 kB (gzip)	31.44 kB / 11.03 kB (gzip)	0% / 0% (gzip)
lite	async-chunk	50.96 kB / 16.56 kB (gzip)	50.96 kB / 16.56 kB (gzip)	0% / 0% (gzip)
pro	loader	52.7 kB / 17.87 kB (gzip)	52.7 kB / 17.86 kB (gzip)	0% / -0.01% (gzip)
pro	async-chunk	93.43 kB / 28.2 kB (gzip)	93.45 kB / 28.21 kB (gzip)	0.02% / 0.02% (gzip)
spa	loader	60.81 kB / 20.37 kB (gzip)	60.81 kB / 20.37 kB (gzip)	0% / 0.01% (gzip)
spa	async-chunk	108.7 kB / 32.63 kB (gzip)	108.72 kB / 32.63 kB (gzip)	0.02% / 0.02% (gzip)
lite-polyfills	loader	125.44 kB / 40.32 kB (gzip)	125.44 kB / 40.32 kB (gzip)	0% / 0% (gzip)
lite-polyfills	async-chunk	65.7 kB / 18.9 kB (gzip)	65.7 kB / 18.9 kB (gzip)	0% / 0% (gzip)
pro-polyfills	loader	147.15 kB / 46.58 kB (gzip)	147.15 kB / 46.58 kB (gzip)	0% / 0% (gzip)
pro-polyfills	async-chunk	113.94 kB / 30.14 kB (gzip)	113.96 kB / 30.15 kB (gzip)	0.01% / 0.03% (gzip)
spa-polyfills	loader	155.35 kB / 48.75 kB (gzip)	155.35 kB / 48.75 kB (gzip)	0% / 0.01% (gzip)
spa-polyfills	async-chunk	130.94 kB / 34.77 kB (gzip)	130.96 kB / 34.78 kB (gzip)	0.01% / 0.03% (gzip)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.38%. Comparing base (a37e9f5) to head (520362e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1039      +/-   ##
==========================================
+ Coverage   87.02%   87.38%   +0.35%     
==========================================
  Files         156      156              
  Lines        7098     7100       +2     
  Branches     1393     1394       +1     
==========================================
+ Hits         6177     6204      +27     
+ Misses        797      779      -18     
+ Partials      124      117       -7     

Flag	Coverage Δ
integration-tests	91.24% <ø> (+0.18%)	⬆️
unit-tests	75.97% <100.00%> (+0.65%)	⬆️

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[metal-messiah]

Approved pending test suite run

[github-actions]

Last ran on May 16, 2024 11:28:27 CDT
Checking merge of (520362e) into main (a37e9f5)