storcli.py: Skip battery backup unit status if it does not exist #191
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Some HPE RAID controllers have an external battery (Energy pack aka HPE Smart Storage Battery) instead of a controller onboard battery backup unit. With our controller (HPE MR416i-a Gen10+) the "BBU Status" field is not present in the storcli output and storcli.py aborts data collection.
This commit skips the BBU Status field if it does not exist.
Closes #190.