paste: permit the delimiter list to be empty #4498

Job	Run time
Build the fuzzers	3m 33s
Run the fuzzers (fuzz_test, true)	2m 17s
Run the fuzzers (fuzz_date, false)	2m 14s
Run the fuzzers (fuzz_expr, true)	4m 0s
Run the fuzzers (fuzz_printf, false)	2m 58s
Run the fuzzers (fuzz_echo, true)	3m 56s
Run the fuzzers (fuzz_seq, false)	2m 55s
Run the fuzzers (fuzz_sort, false)	3m 12s
Run the fuzzers (fuzz_wc, false)	2m 59s
Run the fuzzers (fuzz_cut, false)	2m 57s
Run the fuzzers (fuzz_split, false)	1m 34s
Run the fuzzers (fuzz_tr, false)	1m 26s
Run the fuzzers (fuzz_env, false)	1m 14s
Run the fuzzers (fuzz_parse_glob, true)	4m 1s
Run the fuzzers (fuzz_parse_size, true)	2m 9s
Run the fuzzers (fuzz_parse_time, true)	3m 47s
Run the fuzzers (fuzz_seq_parse_number, true)	3m 48s
	49m 0s

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