Skip input ascii records with not enough columns

[PaulWessel]

See discussion on the forum post. This simply skips the bad line(s) rather than exit.

cat << EOF > t.txt
> First line
1 2 3
4 5
3 2 1
> second
6 5
6 7 8
9 9 9
EOF

gmt convert t.txt
gmtconvert [WARNING]: Mismatch between actual (2) and expected (3) fields near line 3 in file t.txt
gmtconvert [WARNING]: Mismatch between actual (2) and expected (3) fields near line 6 in file t.txt
> First line
1	2	3
3	2	1
> second
6	7	8
9	9	9