bookmark: prevent crashing when a successor is unknown locally (issue3680)
The `%ln` revset substitution does not accept unknown node. We prune unknown node from potential successors before computing descendants. This have no impact on the result of this function. - Descendants of unknown changeset as unknown, - all successors of unknown changesets are already return by the call who returned those same unknown changesets, - unknown changesets are never a valid destination for a bookmark.
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