Use the `excutils.raise_with_cause` after doing our type check
Use the `excutils.raise_with_cause` after doing our type check

Change-Id: Ica886e67b4a75cb695d3ed51a3a952ca8f60f300

jimbobhickville/taskflow,pombredanne/taskflow-1,jimbobhickville/taskflow,junneyang/taskflow,pombredanne/taskflow-1,junneyang/taskflow,openstack/taskflow,openstack/taskflow