Fix TCGC crash when a merged service omits a version for a depended library#4501

tadelesh merged 3 commits into

release/may-2026Azure/typespec-azure:release/may-2026from

copilot/tcgc-cannot-read-propertiesAzure/typespec-azure:copilot/tcgc-cannot-read-propertiesCopy head branch name to clipboard