Reporting: Correct the zeroPower reporting function
Reporting: Correct the zeroPower reporting function

It was looking for values of 0 which would never be found due to type checking; the values
in the database are floats!  Make the comparison non-type-dependent.
We also fix the logging which was trying to use a string as a DateTime object.

bec-uk/bec_fault_mon,bec-uk/bec_services,bec-uk/bec_fault_mon,bec-uk/bec_services,bec-uk/bec_services,bec-uk/bec_fault_mon