prevent running function when not needed

js/LoadSaveFile.js

@@ -36,12 +36,20 @@ let bench = {
  * @param {FileList} input FileList object containing a list of File objects. The FileList behaves like an array, so you can check its length property to get the number of selected files.
  */
 function LoadSaveFile(input, startTime = new Date()) {
+
+    // console.info("Input length: " + input.files.length)
+    // Cease further processing if user canceled the file input dialog
+    if (input.files.length < 1) return false;
+
     // start benchmark
     bench.begin.LSF = startTime;
 
     // Prepares a File object from the first file of the input files for reading as an Array Buffer
     let inputFileObject = input.files[0];
 
+    // Cleans the file list to avoid problems after subsequent use
+    // document.getElementById("save-area-file").value = "";
+
     // 1. read file
     // The ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer.
     // It is an array of bytes, often referred to in other languages as a "byte array".