Error reading from database while downloading participants table data. Extra comma in code

Setup

1. Login as admin
2. Navigate to Users > Accounts > User profile fields in site administration
3. Create a new Text input profile field:
   • Short name: food
   • Name: Food
   • Character limit: 128
4. Create a new user
   • Food: Potato
5. Create a course
6. Enrol user as a student in the course

With identity fields

1. Navigate to Users > Permissions > User policies in site administration
2. Set Show user identity to
   • Email address
   • Food
3. Save changes
4. Go to the course and navigate to course participants
5. Select all participants
6. Press With selected users... Download table data as .pdf
7. Confirm file is downloaded, Email address and Food columns are present

Without identity fields

1. Navigate to Users > Permissions > User policies in site administration
2. Clear Show user identity value (so nothing is checked)
3. Save changes
4. Go to the course and navigate to course participants
5. Select all participants
6. Press With selected users... Download table data as .pdf
7. Confirm file is downloaded, no identity field columns are present