Instead of crash with an assertion error, simply exit the function
`SyncMetaData` if there is no metadata to sync.
Fixes#13110.
Github-Pull: #13265
Rebased-From: b0d2ca9fb66d793e3c0f2e6ede811f1b16c33a9f
Tree-SHA512: 67e446e9ced901e37003a9661b6abea268e2ea648ac3b076d91c8d996de96bed389839a09d579a6562d930bcf501a091eb67454f474aae1174108a8650502072