old_contents: # Ignore this file
  
  {'paper_abstract': 'An abstract',
   'authors': [{'first_names': 'XX',
                'surname': 'XXX',
                'address': 'XXX',
                'country': 'XXX',
                'email_address': 'xxx@XXX',
                'institution': 'XXX'}],
                'title': ''}
  
  
new_contents: # Ignore this file
  
  {'paper_abstract': '',
   'authors': [{'first_names': 'XX',
                'surname': 'XXX',
                'address': 'XXX',
                'country': 'XXX',
                'email_address': 'xxx@XXX',
                'institution': 'XXX'}],
                'title': ''}
  
  
subject: Add empty abstract to data file.