code: public <T extends StatementDocument> void nullEdit(ItemIdValue itemId)
  			throws IOException, MediaWikiApiErrorException {
  		ItemDocument currentDocument = (ItemDocument) this.wikibaseDataFetcher
  				.getEntityDocument(itemId.getId());
  		
  		nullEdit(currentDocument);
  	}
docs: Performs a null edit on an item. This has some effects on Wikibase,
  such as refreshing the labels of the referred items in the UI.
  
  @param itemId
  the document to perform a null edit on
  @throws MediaWikiApiErrorException
  if the API returns errors
  @throws IOException
  if there are any IO errors, such as missing network connection