paste: permit the delimiter list to be empty #4357

Job	Run time
Build the fuzzers	3m 42s
Run the fuzzers (fuzz_test, true)	4m 2s
Run the fuzzers (fuzz_date, false)	3m 53s
Run the fuzzers (fuzz_expr, true)	3m 57s
Run the fuzzers (fuzz_printf, false)	3m 0s
Run the fuzzers (fuzz_echo, true)	3m 56s
Run the fuzzers (fuzz_seq, false)	3m 4s
Run the fuzzers (fuzz_sort, false)	3m 3s
Run the fuzzers (fuzz_wc, false)	2m 59s
Run the fuzzers (fuzz_cut, false)	2m 56s
Run the fuzzers (fuzz_split, false)	3m 15s
Run the fuzzers (fuzz_tr, false)	3m 40s
Run the fuzzers (fuzz_env, false)	2m 53s
Run the fuzzers (fuzz_parse_glob, true)	3m 47s
Run the fuzzers (fuzz_parse_size, true)	3m 56s
Run the fuzzers (fuzz_parse_time, true)	3m 47s
Run the fuzzers (fuzz_seq_parse_number, true)	3m 51s
	59m 41s

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