fix / avellaneda status msg

[keithbaum]

Changed condition to check for "volatility is not NaN" since when volatility=0 although being valid number "bool(volatility) =False" and status message was not showing.

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• Your code builds clean without any errors or warnings
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A description of the changes proposed in the pull request:

[RC-13]

Tested and confirmed that PR fix the reported issue.
Liquid:

Kraken:

Observe the bots for 1 hour and the strategy parameters doesn't go away

[CrimsonJacket]

I don't think this is correct. I do know that checking if a variable is NaN, we can't just use a is not NaN or a != NaN. We should use math.isnan() or its equivalent.

[PtrckM]

Re-test no issue found (run time 1hr), reapproving

[CrimsonJacket]

LGTM