<https://ninjateknik.com/hur-man-kontrollerar-om-en-cell-inte-ar-tom-i-google-sheets/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ninjateknik.com/hur-man-kontrollerar-om-en-cell-inte-ar-tom-i-google-sheets/>