`kgtk query` Ignores Input Data Lines that Start with Tab

[CraigMiloRogers]

If an input data line starts with a tab, kgtk query drops the line in processing.

Suppose xxx.tsv contains:

blank   node1   label   node2
        Q001    R001    Q002

Attempting to use this file yields:

 kgtk query -i xxx.tsv --return '*'
blank   node1   label   node2