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represent empty optional output clauses, distinguishing them from
missing clauses. This creates an ambiguity, so that an @(output)
block which puts out a single empty line is treated as empty.
Present but empty clauses are now represented by t.
* match.c (do_output_line): Check for t and bail.
(do_output): Check for t instead of (nil) and bail.
* parser.y (o_elems_opt2): Nonterminal deleted.
(out_clauses_opt): Empty case generates nil.
(req_parts_opt): o_elems_opt2 replaced by o_elems_opt.
(repeat_rep_helper): Function now keeps track of which
clauses were specified. For those that were specified, but
empty, it substitutes t.
* tests/008/empty-clauses.expected: New file.
* tests/008/empty-clauses.txr: New file.
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