fix KeyErrors from reading empty dirstate
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
fix KeyErrors from reading empty dirstate
manifest hash:
04a797f1b53e34153c8ea18950a5dd0eefb4694d
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Version: GnuPG v1.4.0 (GNU/Linux)
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nP/Y3F1GvOle58NTIQ6UBA==
=0k3O
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