thread-pool: Initialize empty pools to start complete.
thread-pool: Initialize empty pools to start complete.

Otherwise waiting for completion if we push no work hangs.

Change-Id: I7103bdb779eb66a65cd8496091e72a0c65eb3567

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core