(DON'T MERGE) stbt batch run: Don't show in-progress test in html report

With a custom "columns.yaml" that shows "-" in a column until the test
has completed (at which point the column is filled in with real data
from the test-run), tablequeryjs fails with "TypeError: this._d is
undefined", presumably in its logic to determine the datatype of the
column based on the first row.