[backport] zephyr: Add zero-len check for utf8_trunc #77957
Labels
area: Testsuite
Testsuite
area: Utilities
Backport
Backport PR and backport failure issues
bug
The issue is a bug, or the PR is fixing a bug
priority: low
Low impact/importance bug
Milestone
Missing string check fixed in #74949 needs to be backported.
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