add date validation check before casting to string

src/app/components/dialog/CoastlineEvolutionDialog.jsx

@@ -48,7 +48,7 @@ function showErrorShorelineImages(){
     clearInterval(intervalCodeShowErrorShorelineImages);
   }
 }
-function sortOutput(data){
+function sortOutput(data){  // TODO make nan safe, test corner cases, improve sorting, separate date and distance treatment in functions
   data.forEach(el=>{
     let txtDates = el.dates;
     let txtDistances = el.distances;
@@ -83,7 +83,7 @@ function sortOutput(data){
            }
        }
    } while (swapped);
-    dates = dates.map(el => el.toISOString());
+    dates = dates.map(el => isFinite(el) ? el.toISOString() : "");
     distancesTxtArray = distancesTxtArray.map(el => Number.parseFloat(el).toFixed(2));
     el.dates = '"' + JSON.stringify(dates).replace(/"/g, "'").replace(/.000Z/g,"") +'"';
     el.distances = '"' + JSON.stringify(distancesTxtArray).replace(/"/g, "'").replace(/'/g, "") +'"' ;