Fix occasional failures of triage-issue job

[SlyCaptainFlint]

Summary:

I added a new step to the triage-issue job last week, to add descriptive labels to issues based on their title. This job has occasionally be failing, like this. This happens when no applicable labels are found, and we send up an empty array to the add labels endpoint. Adding an array length check to protect against this case.

Changelog:

[INTERNAL] [FIXED] - Fixed occasional failures in the issue triage pipeline related to issue labeling

Test Plan:

Repro run in my repository before the fix: https://github.com/SlyCaptainFlint/react-native/actions/runs/4631843716 (note that the error is the same as in the example failure listed in the description)
And here is a success on the same issue after the fix: https://github.com/SlyCaptainFlint/react-native/actions/runs/4631920441

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,604,613	+0
android	hermes	armeabi-v7a	7,918,523	+0
android	hermes	x86	9,090,481	+0
android	hermes	x86_64	8,945,565	+0
android	jsc	arm64-v8a	9,173,833	+0
android	jsc	armeabi-v7a	8,365,493	+0
android	jsc	x86	9,231,488	+0
android	jsc	x86_64	9,490,181	+0

Base commit: bfaedfe
Branch: main

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cortinico merged this pull request in ad4a857.