indexer: handle missing parent objects in shallow clones and root commits#21

Vui-Chee wants to merge 1 commit intofacebookexperimental:mainfacebookexperimental/semcode:mainfrom

Vui-Chee:fix/shallow-clone-object-not-foundVui-Chee/semcode:fix/shallow-clone-object-not-foundCopy head branch name to clipboard