Rob Cresswell 6be47ced8e Improve logic for volume snapshots tab
This makes the logic around retrieving volume data in the volume
snapshot page slightly safer. Previously, if the snapshots loaded but
volume didn't a NameError could occur, and the error message would have
been incorrect. This patch fixes both of those issues.

Change-Id: I53df72005b343a9836ed96af045a1f0eb0b3c31d
Related-Bug: 1323644
2017-07-27 15:57:03 +00:00
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