media_entity_download_count_file_access() doesn't account for empty response from file_get_file_references()

Problem/Motivation

When calling file_get_file_references() in media_entity_download_count_file_access(), the module doesn't check if the returned value is empty. Without this, the following call occurs with empty variables, resulting in a BSOD:

$download_entity = $entity_type_manager
      ->getStorage($entity_type)
      ->load($entity_id)
      ->bundle();

Steps to reproduce

In one site, this was replicated by having an authenticated user (with no other roles) upload a new profile picture and save their profile.

Proposed resolution

Add checking for empty on either of the two variables. If empty, return.

Remaining tasks

Create patch.

User interface changes

None.

API changes

None.

Data model changes

None.