Added has-null

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2015-07-02 14:57:37
Author local date 2015-07-02 16:57:37 +0200
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2015-07-02 14:57:37
Committer local date 2015-07-02 16:57:37 +0200
Commit b4894c2ae2f5e84a77fbf51b3598b6d34ec48871
Tree 83d13f1188ce5f247d13dcb2d6a80ac10d0f62e0
Parent 497e50935f2c0313f1885068dbeaa76e890d8c0d
Added has-null
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