Big thanks to @ericzc0423, @flintforge, @geertn, @marji, and @jage, for their help.
This fixes two small issues with numeric handling:
get_datanow ensures that all (expected) numeric data points default to zero in the event of an empty string (non-numeric addition); and- It is no longer assumed that every
BACKENDhas at least one server associated with it (divide-by-zero error).