Important: #101621 - Changed default value for twitter_card field 

See forge#101621

Description 

The default value of the twitter_card field of a page is now an empty string instead of summary.

Meta tag <meta name="twitter:card"> is only rendered if one of the following fields is filled in,

  • twitter_title
  • twitter_description
  • twitter_image
  • twitter_card
  • og_title
  • og_description
  • og_image

If no twitter card is selected, the fallback value is summary.