Portworx: Cloudsnap restore depends on original pvc being present

[disrani-px]

Is this a BUG REPORT or FEATURE REQUEST?:
BUG REPORT

What happened:
When restoring from cloudsnaps the original pvc is queried. This can fail if the original pvc has been deleted.

What you expected to happen:
Restore should go through even if original pvc is deleted

How to reproduce it (as minimally and precisely as possible):

1. Create PVC
2. Create cloudsnap from PVC
3. Delete PVC
4. Restore from cloudsnap

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version):
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: