assertion fails because cluster could be None
assertion fails because cluster could be None

Object is being used in one of the Assert statements however it is not
callable. Fixed it.

Signed-off-by: Prasanna Santhanam <82219615980488abd2acc1a3d71cfb58f0b2b8b6@apache.org>
(cherry picked from commit 479f89ca3c43bef2ee3258cf3e78f7843a7d53cb)

mufaddalq/cloudstack-datera-driver,mufaddalq/cloudstack-datera-driver,mufaddalq/cloudstack-datera-driver,mufaddalq/cloudstack-datera-driver,mufaddalq/cloudstack-datera-driver,mufaddalq/cloudstack-datera-driver