Update 188 attribute to cover 0 value

[aivus]

Hello

I noticed that in case 188 attribute has value 0 it is shown as warn with the Could not determine Observed Failure Rate for Critical Attribute tooltip.

This is happening because comparison logic in smart_ata_attribute.go doesn't include low value. But in case low == high bucket will be selected.

[AnalogJ]

I think updating the threshold logic makes more sense than creating a 0,0 bucket. What do you think?

[aivus]

I'll try to find time to rework logic