fix: CLC metadata panic

[wdhif]

What does this PR do?

Check config.Instances to avoid panic: runtime error: index out of range [0] with length 0.

Motivation

Fixes DataDog/helm-charts#2349

Describe how you validated your changes

CI and E2E tests.

Additional Notes

[agent-platform-auto-pr]

Files inventory check summary

File checks results against ancestor ce22e11e:

Results for datadog-agent_7.78.0~devel.git.728.bb9ebbb.pipeline.105211352-1_amd64.deb:

No change detected

[agent-platform-auto-pr]

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor ce22e11
📊 Static Quality Gates Dashboard
🔗 SQG Job
SOME SIZE DELTAS ARE N/A (ANCESTOR METRICS NOT YET AVAILABLE). RETRY JOB

Successful checks

Info

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	N/A	N/A → 749.066 → 750.720
✅	agent_deb_amd64_fips	N/A	N/A → 707.416 → 711.230
✅	agent_heroku_amd64	N/A	N/A → 312.836 → 320.580
✅	agent_rpm_amd64	N/A	N/A → 749.050 → 750.690
✅	agent_rpm_amd64_fips	N/A	N/A → 707.399 → 711.210
✅	agent_rpm_arm64	N/A	N/A → 727.500 → 732.890
✅	agent_rpm_arm64_fips	N/A	N/A → 688.812 → 694.440
✅	agent_suse_amd64	N/A	N/A → 749.050 → 750.690
✅	agent_suse_amd64_fips	N/A	N/A → 707.399 → 711.210
✅	agent_suse_arm64	N/A	N/A → 727.500 → 732.890
✅	agent_suse_arm64_fips	N/A	N/A → 688.812 → 694.440
✅	docker_agent_amd64	N/A	N/A → 809.388 → 813.040
✅	docker_agent_arm64	N/A	N/A → 812.652 → 819.570
✅	docker_agent_jmx_amd64	N/A	N/A → 1000.304 → 1003.920
✅	docker_agent_jmx_arm64	N/A	N/A → 992.346 → 999.170
✅	docker_cluster_agent_amd64	N/A	N/A → 203.708 → 206.270
✅	docker_cluster_agent_arm64	N/A	N/A → 218.167 → 220.000
✅	docker_cws_instrumentation_amd64	N/A	N/A → 7.142 → 7.180
✅	docker_cws_instrumentation_arm64	N/A	N/A → 6.689 → 6.920
✅	docker_dogstatsd_amd64	N/A	N/A → 39.215 → 39.380
✅	docker_dogstatsd_arm64	N/A	N/A → 37.445 → 37.940
✅	dogstatsd_deb_amd64	N/A	N/A → 29.855 → 30.610
✅	dogstatsd_deb_arm64	N/A	N/A → 28.007 → 29.110
✅	dogstatsd_rpm_amd64	N/A	N/A → 29.855 → 30.610
✅	dogstatsd_suse_amd64	N/A	N/A → 29.855 → 30.610
✅	iot_agent_deb_amd64	N/A	N/A → 43.065 → 43.290
✅	iot_agent_deb_arm64	N/A	N/A → 40.128 → 40.920
✅	iot_agent_deb_armhf	N/A	N/A → 40.860 → 41.030
✅	iot_agent_rpm_amd64	N/A	N/A → 43.066 → 43.290
✅	iot_agent_suse_amd64	N/A	N/A → 43.066 → 43.290

On-wire sizes (compressed)

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	N/A	N/A → 174.247 → 177.700
✅	agent_deb_amd64_fips	N/A	N/A → 165.226 → 172.230
✅	agent_heroku_amd64	N/A	N/A → 74.904 → 79.970
✅	agent_rpm_amd64	N/A	N/A → 177.174 → 180.780
✅	agent_rpm_amd64_fips	N/A	N/A → 167.243 → 173.370
✅	agent_rpm_arm64	N/A	N/A → 159.594 → 161.610
✅	agent_rpm_arm64_fips	N/A	N/A → 151.271 → 155.910
✅	agent_suse_amd64	N/A	N/A → 177.174 → 180.780
✅	agent_suse_amd64_fips	N/A	N/A → 167.243 → 173.370
✅	agent_suse_arm64	N/A	N/A → 159.594 → 161.610
✅	agent_suse_arm64_fips	N/A	N/A → 151.271 → 155.910
✅	docker_agent_amd64	N/A	N/A → 267.218 → 271.240
✅	docker_agent_arm64	N/A	N/A → 254.503 → 259.800
✅	docker_agent_jmx_amd64	N/A	N/A → 335.876 → 339.870
✅	docker_agent_jmx_arm64	N/A	N/A → 319.142 → 324.390
✅	docker_cluster_agent_amd64	N/A	N/A → 71.297 → 72.920
✅	docker_cluster_agent_arm64	N/A	N/A → 66.935 → 68.220
✅	docker_cws_instrumentation_amd64	N/A	N/A → 2.999 → 3.330
✅	docker_cws_instrumentation_arm64	N/A	N/A → 2.729 → 3.090
✅	docker_dogstatsd_amd64	N/A	N/A → 15.160 → 15.820
✅	docker_dogstatsd_arm64	N/A	N/A → 14.483 → 14.830
✅	dogstatsd_deb_amd64	N/A	N/A → 7.885 → 8.790
✅	dogstatsd_deb_arm64	N/A	N/A → 6.773 → 7.710
✅	dogstatsd_rpm_amd64	N/A	N/A → 7.898 → 8.800
✅	dogstatsd_suse_amd64	N/A	N/A → 7.898 → 8.800
✅	iot_agent_deb_amd64	N/A	N/A → 11.351 → 12.040
✅	iot_agent_deb_arm64	N/A	N/A → 9.665 → 10.450
✅	iot_agent_deb_armhf	N/A	N/A → 9.894 → 10.620
✅	iot_agent_rpm_amd64	N/A	N/A → 11.369 → 12.060
✅	iot_agent_suse_amd64	N/A	N/A → 11.369 → 12.060

[wdhif]

Closing in favor of #49350