tranpose bug with comma field-separator

[Charles Read]

Steps to reproduce:

     1. Put this data in the file /tmp/z0.txt:

A,B,C,D,E,F,G,H,I,J

0,1,2,3,4,5,6,7,8,9

     2. Then run:

$ datamash --field-separator=, transpose < /tmp/z0.txt 

A,0

B,1

C,2

D,3

E,4

F,5

G,6

H,7

I,8

,9

Notice the last transposed row omits the column-name "J".

Version on OSX / Catalina (installed through brew):

$ datamash --version

datamash (GNU datamash) 1.6

Copyright (C) 2020 Assaf Gordon

License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

Written by Assaf Gordon.

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