Fixes #238. Ensure the current value is at least the number 0 (it may be null or 0)
Fixes #238. Ensure the current value is at least the number 0 (it may be null or 0)

Signed-off-by: Rick Waldron <dd8fdbe95c7f81f312b273ef8860922803e9ef16@gmail.com>

joelunmsm2003/arduino,AnnaGerber/johnny-five,kod3r/johnny-five,kod3r/johnny-five,cumbreras/rv