Space logo links are incorrect in the dashboard and recently updated macros

As part of CONF-11494 we changed how space logos were stored, which meant that they now appear in the dashboard and recently updated macros when changed.

However, the macros assume that all images are attached to a page which is not the case for space logos. This results in this url:

http://bri-bri:8080/confluence/download/attachments/589825&highlight=BSA#null-attachment-BSA

Clicking on the link results in a "Page Not Found' error. Note the "null" where the page id usually is.