monitoring: Corrected monitoring manager nil checks
monitoring: Corrected monitoring manager nil checks

Change-Id: I8f175fd4b4ff093c7aad3f3e66454b2d19e07900
Signed-off-by: Shubhendu Tripathi <abf833e62503b33bb0dfae62bb381d87d91f8de1@redhat.com>

skyrings/bigfin,skyrings/bigfin,skyrings/bigfin