Only show file system chart when there is >0 file systems #1056
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Fixes: #1055
There is a permutation where the standard QEMU guest agent
will not report actual per file system data. In this case, the
VM's
disks.usage
statistic is an empty array. This case isnow tested, and if the usage array is empty, the unallocated vs
provisioned donut chart is displayed (as if the guest agent is
not installed).
Showing the same VM used to report #1055: