Don't filter by area if no area is drawn

  const [dateCheckVal, setDateCheckVal] = React.useState(false);       // Date

  // Filter by X values

  const [areaTextVal, setAreaTextVal] = React.useState("");

  const [areaTextVal, setAreaTextVal] = React.useState("");       // Area (received by window message from AstroDrawFilterControl)

  const [keywordTextVal, setKeywordTextVal] = React.useState(""); // Keyword

  const [dateFromVal, setDateFromVal] = React.useState(null);     // From Date

  const [dateToVal, setDateToVal] = React.useState(null);         // To Date

    if(keywordCheckVal) myQueryString += "keywords=[" + keywordTextVal.split(" ") + "]&";

    // Area

    // We need to get the area selected from the Leaflet side of the application.

    // Look at (possibly old or CartoCosmos) code with the query console/WKT Box.

    if(areaCheckVal) myQueryString += areaTextVal;

    if(areaCheckVal && areaTextVal !== "") myQueryString += areaTextVal;

    // Sorting... Not supported by the API?

    const sortAscDesc = sortAscCheckVal ? "asc" : "desc";