Guard InternalTagAdder against null prebuilt tagmap entry

[amarziali]

Backport #11958 to release/v1.64.x

[datadog-prod-us1-3]

More details

This backport adds defensive null-checking for the baseServiceEntry field before setting it on the tag map. The fix is correct and necessary: Entry.create() can return null if the service name is empty, and without this guard, calling set(null) would cause a NullPointerException. The fix has no impact on normal execution paths and doesn't alter behavior for non-empty service names.

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[datadog-prod-us1-3]

🎯 Code Coverage (details)
• Patch Coverage: 50.00%
• Overall Coverage: 56.44% (-0.49%)

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[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	13.90 s	13.98 s	[-1.3%; +0.1%] (no difference)
startup:insecure-bank:tracing:Agent	12.94 s	12.99 s	[-1.0%; +0.2%] (no difference)
startup:petclinic:appsec:Agent	16.92 s	16.82 s	[-0.3%; +1.5%] (no difference)
startup:petclinic:iast:Agent	16.30 s	16.93 s	[-8.0%; +0.5%] (no difference)
startup:petclinic:profiling:Agent	16.68 s	16.85 s	[-2.5%; +0.5%] (no difference)
startup:petclinic:sca:Agent	16.97 s	16.90 s	[-0.5%; +1.4%] (no difference)
startup:petclinic:tracing:Agent	16.14 s	15.65 s	[-1.3%; +7.5%] (no difference)

Commit:beee258a · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.