Single row txt and csv files are corrupted

[sswan]

It looks like the txt and csv parsers choke on single-row files:

mswan@cee-pp-ldrd02 $ cat bad_single_row.txt 
a b c
1 2 3
mswan@cee-pp-ldrd02 $ thresh bad_single_row.txt 
                         a
  +1.00000000000000000e+00
  +2.00000000000000000e+00
  +3.00000000000000000e+00
mswan@cee-pp-ldrd02 $ cat bad_single_row.csv 
a,b,c
1,2,3
mswan@cee-pp-ldrd02 $ thresh bad_single_row.csv
                         a
  +1.00000000000000000e+00
  +2.00000000000000000e+00
  +3.00000000000000000e+00
mswan@cee-pp-ldrd02 $ thresh cat "a=[1]" "b=[2]" "c=[3]"
WARNING: No files to read in.
                         a                         b                         c
  +1.00000000000000000e+00  +2.00000000000000000e+00  +3.00000000000000000e+00