The Json for article images is incorrect

[obuisard]

Json for images is not properly generated.

Example of what we get:

{"image_intro":/var/www/html/2020/03/BAPHlogo.png,"image_intro_alt":BAPHlogo,"float_intro":"","image_intro_caption":,"image_fulltext":/var/www/html/2020/03/BAPHlogo.png,"image_fulltext_alt":BAPHlogo,"float_fulltext":"","image_fulltext_caption":}

What we should get:

{"image_intro":"/var/www/html/2020/03/BAPHlogo.png","image_intro_alt":"BAPHlogo","float_intro":"","image_intro_caption":"","image_fulltext":"/var/www/html/2020/03/BAPHlogo.png","image_fulltext_alt":"BAPHlogo","float_fulltext":"","image_fulltext_caption":""}