[QA] Dataset label is missing for uploaded datasets

# Problem description

On the experiment result page, the dataset label is not shown. Instead, the name of the uploaded file is listed. This makes it harder to distinguish results if generic file names are used. Examples:
* https://gerbil-qa.aksw.org/gerbil/experiment?id=202509090001
* https://gerbil-qa.aksw.org/gerbil/experiment?id=202509080002