fixes #1476 

Collections from blocked servers are crippled so that the map still appears to attempt loading.

To test (for example):
* comment out the entry for catami.org from Config.groovy
* delete or cripple catami.org from the database
* add  the Catami layer, from the AUV platform
This is BTW not the correct comment, the server is not blacklisted, it is not whitelisted to perform requests.