getdeps: fix a crash if the project_hashes directory does not exist
Summary: This makes getdeps.py no longer crash if used in the folly repository. Folly does not depend on any other Facebook projects, so it does not include a `build/deps` directory. Reviewed By: wez Differential Revision: D16778009 fbshipit-source-id: 41be53d862f41b62154b081eb90ddba8742658fe
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