avoid refreshing the list for search providers (#3837)
avoid refreshing the list for search providers (#3837)

external content should not be affected by superdesk events.

SDCP-491
superdesk/superdesk-client-core,petrjasek/superdesk-client-core,superdesk/superdesk-client-core,petrjasek/superdesk-client-core,petrjasek/superdesk-client-core,petrjasek/superdesk-client-core,superdesk/superdesk-client-core,superdesk/superdesk-client-core,petrjasek/superdesk-client-core,superdesk/superdesk-client-core