FED-75: Fix Backplane 2 creates bus even while issuing bus owner error
(cherry picked from commit 67bf64c2796641a2db8d8033752690270e546aae)
FED-93: No subscribers no polling

Avoid polling the server if there are no subscribers.
(cherry picked from commit 220de2ccf7583ead0ab6e2c10e02835f923c06bd)