tree 7e3632965576f27982e3a48aad7dfc414918dc6d
parent d0412510b1ae2b3f3085fafe073648e1761dcf9a
author Michajlo Matijkiw <michajlo@google.com> 1445368876 +0000
committer Han-Wen Nienhuys <hanwen@google.com> 1445438172 +0000

Make EmptySkyValue not serializable

Should be a singleton, should never be serialized or deserialized,
but add equals and hash code as well for good measure.

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MOS_MIGRATED_REVID=105888511