Filter out NIL from group lines.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2018-11-04 15:49:16
Author local date 2018-11-04 16:49:16 +0100
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2018-11-04 15:49:16
Committer local date 2018-11-04 16:49:16 +0100
Commit 40f6e820ff60dfb9f42cc57c28039d0bcb32aa9c
Tree 779b81acda2ba351bbdf137e3ce9de5adde4dd2b
Parent 2a4282afd62a56ff2164a375c987cf51c7e68cb8
Filter out NIL from group lines.
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