refactor: only add aggregation in fragment if value is present

[anandtiwary]

Description

Please include a summary of the change, motivation and context.
refactor: only add aggregation in fragment if value is present

Testing

Please describe the tests that you ran to verify your changes. Please summarize what did you test and what needs to be tested e.g. deployed and tested helm chart locally.

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

Documentation

Make sure that you have documented corresponding changes in this repository or hypertrace docs repo if required.

[codecov]

Codecov Report

Merging #789 (ef4495e) into main (35b7136) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #789   +/-   ##
=======================================
  Coverage   85.41%   85.42%           
=======================================
  Files         792      792           
  Lines       16163    16167    +4     
  Branches     2061     2061           
=======================================
+ Hits        13806    13810    +4     
  Misses       2326     2326           
  Partials       31       31           

Impacted Files	Coverage Δ
projects/distributed-tracing/src/public-api.ts	100.00% <100.00%> (ø)
...ification/explore/explore-specification-builder.ts	79.31% <100.00%> (+2.38%)	⬆️

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[github-actions]

Unit Test Results

    4 files  ±0  250 suites  ±0   14m 38s ⏱️ -6s
897 tests ±0  897 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
903 runs  ±0  903 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 3722a76. ± Comparison against base commit 35b7136.