#65: Don't start uploading if no file was selected

public/js/blue-twilight.js

@@ -22923,6 +22923,13 @@ function UploadPhotosViewModel(album_id, queue_token, language, urls) {
             // Get the selected files
             var files = fileSelect[0].files;
 
+            if (files.length === 0)
+            {
+                alert(language.no_file_selected);
+                event.preventDefault();
+                return false;
+            }
+
             // Reset statistics
             this.currentStatus = '';
             this.statusMessages = [];