Add an error message when no table headers have data-priority attributes for the column toggle table.
Add an error message when no table headers have data-priority attributes for the column toggle table.

shoikot/tablesaw,ilovezy/tablesaw,anthonygentile/tablesaw,ezekielchentnik/tablesaw,geo242/tablesaw,sebdm/tablesaw,silverhawk184/tablesaw,geo242/tablesaw,anthonygentile/tablesaw,anthonygentile/tablesaw,silverhawk184/tablesaw,ilovezy/tablesaw,sebdm/tablesaw,shoikot/tablesaw,shoikot/tablesaw,ilovezy/tablesaw,geo242/tablesaw,filamentgroup/tablesaw,filamentgroup/tablesaw,ezekielchentnik/tablesaw,ezekielchentnik/tablesaw,silverhawk184/tablesaw