Huawei: Create snapshot have a log error
Huawei: Create snapshot have a log error

When creating snapshot, if the volume does not exist
there will be lead to a log error. This patch will
fix this.

Closes-Bug:#1545912
Change-Id:Ic99531dad4fab5e22e295e19bbfa94c7892e3ddc

mahak/cinder,bswartz/cinder,j-griffith/cinder,eharney/cinder,Hybrid-Cloud/cinder,Nexenta/cinder,openstack/cinder,Datera/cinder,mahak/cinder,Nexenta/cinder,phenoxim/cinder,cloudbase/cinder,phenoxim/cinder,openstack/cinder,NetApp/cinder,j-griffith/cinder,Datera/cinder,ge0rgi/cinder,bswartz/cinder,Hybrid-Cloud/cinder,cloudbase/cinder,NetApp/cinder,eharney/cinder