fix bug #412

public/self/dataset_preview.js

@@ -626,7 +626,7 @@ function showfilelist(){
         console.log(tmpIndex)
         if(tmpIndex != -1){
             fname = labeltastresult[i].pic_image_field.substring(tmpIndex + 1);
-            fname = fname.substring(fname.indexOf('/'));
+            fname = fname.substring(fname.indexOf('/')+1);
         }
     }