FreeNAS/freenas 4d13f04gui/vm/migrations 0009_auto_20190315_1058.py

Volume check in migration (#2770)

This commit checks if a volume exists before selecting the first volume as in the case where we don't have any volumes i.e build, this will result in a failure.
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+5-1gui/vm/migrations/0009_auto_20190315_1058.py
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